Why generators show "engine does not crank": 36 documented causes and brand-specific fixes, compiled across 13 manufacturers.
Battery is low or terminals are dirty
3 brands- DynaGen: Clean terminals and re-charge battery
- DynaGen Technologies: Clean terminals and re-charge battery
- GSC: Clean terminals and re-charge battery
Fuse FI on the control panel is blown
2 brands- Cummins/Onan: 1. Replace the fuse with one of the same type and amp rating. If fuse FI blows again, refer to wiring diagram in Section 7 to locate short or defective component. 2a. Recharge or replace the battery. Specific gravity for a fully charged battery is approximately 1.260 at 80° F (27° C). 2b. Clean and tighten or replace the battery cable connectors and cables at the battery and the set. 2c. Adjust charge rate of battery charging circuit. Refer to Battery Charge Rate Adjustment in Section 6. 3a. Test Start / Stop / Test switch and wiring. 3b. Test solenoid K11 and wiring. 4a. Check wiring continuity between battery (B+) and the start solenoid contact (BAT). 4b. Test starter, see engine service manual.
- Orion: 1. Replace the fuse with one of the same type and amp rating. If fuse FI blows again, refer to wiring diagram in Section 7 to locate short or defective component. 2a. Recharge or replace the battery. Specific gravity for a fully charged battery is approximately 1.260 at 80° F (27° C). 2b. Clean and tighten or replace the battery cable connectors and cables at the battery and the set. 2c. Adjust charge rate of battery charging circuit. Refer to Battery Charge Rate Adjustment in Section 6. 3a. Test Start / Stop / Test switch and wiring. 3b. Test solenoid K11 and wiring. 4a. Check wiring continuity between battery (B+) and the start solenoid contact (BAT). 4b. Test starter, see engine service manual.
Insufficient battery voltage due to: a. Batteries not charged. b. Battery connections loose or dirty. c. Insufficient battery charging voltage
2 brands- Cummins/Onan: 1. Replace the fuse with one of the same type and amp rating. If fuse FI blows again, refer to wiring diagram in Section 7 to locate short or defective component. 2a. Recharge or replace the battery. Specific gravity for a fully charged battery is approximately 1.260 at 80° F (27° C). 2b. Clean and tighten or replace the battery cable connectors and cables at the battery and the set. 2c. Adjust charge rate of battery charging circuit. Refer to Battery Charge Rate Adjustment in Section 6. 3a. Test Start / Stop / Test switch and wiring. 3b. Test solenoid K11 and wiring. 4a. Check wiring continuity between battery (B+) and the start solenoid contact (BAT). 4b. Test starter, see engine service manual.
- Orion: 1. Replace the fuse with one of the same type and amp rating. If fuse FI blows again, refer to wiring diagram in Section 7 to locate short or defective component. 2a. Recharge or replace the battery. Specific gravity for a fully charged battery is approximately 1.260 at 80° F (27° C). 2b. Clean and tighten or replace the battery cable connectors and cables at the battery and the set. 2c. Adjust charge rate of battery charging circuit. Refer to Battery Charge Rate Adjustment in Section 6. 3a. Test Start / Stop / Test switch and wiring. 3b. Test solenoid K11 and wiring. 4a. Check wiring continuity between battery (B+) and the start solenoid contact (BAT). 4b. Test starter, see engine service manual.
Start solenoid (K11) not energized due to: a. Defective Start / Stop / Test switch (S11). b. Defective solenoid (K11)
2 brands- Cummins/Onan: 1. Replace the fuse with one of the same type and amp rating. If fuse FI blows again, refer to wiring diagram in Section 7 to locate short or defective component. 2a. Recharge or replace the battery. Specific gravity for a fully charged battery is approximately 1.260 at 80° F (27° C). 2b. Clean and tighten or replace the battery cable connectors and cables at the battery and the set. 2c. Adjust charge rate of battery charging circuit. Refer to Battery Charge Rate Adjustment in Section 6. 3a. Test Start / Stop / Test switch and wiring. 3b. Test solenoid K11 and wiring. 4a. Check wiring continuity between battery (B+) and the start solenoid contact (BAT). 4b. Test starter, see engine service manual.
- Orion: 1. Replace the fuse with one of the same type and amp rating. If fuse FI blows again, refer to wiring diagram in Section 7 to locate short or defective component. 2a. Recharge or replace the battery. Specific gravity for a fully charged battery is approximately 1.260 at 80° F (27° C). 2b. Clean and tighten or replace the battery cable connectors and cables at the battery and the set. 2c. Adjust charge rate of battery charging circuit. Refer to Battery Charge Rate Adjustment in Section 6. 3a. Test Start / Stop / Test switch and wiring. 3b. Test solenoid K11 and wiring. 4a. Check wiring continuity between battery (B+) and the start solenoid contact (BAT). 4b. Test starter, see engine service manual.
Starter (B1) not energized due to: a. Open circuit between battery (B+) and start solenoid (BAT). b. Defective starter (B1)
2 brands- Cummins/Onan: 1. Replace the fuse with one of the same type and amp rating. If fuse FI blows again, refer to wiring diagram in Section 7 to locate short or defective component. 2a. Recharge or replace the battery. Specific gravity for a fully charged battery is approximately 1.260 at 80° F (27° C). 2b. Clean and tighten or replace the battery cable connectors and cables at the battery and the set. 2c. Adjust charge rate of battery charging circuit. Refer to Battery Charge Rate Adjustment in Section 6. 3a. Test Start / Stop / Test switch and wiring. 3b. Test solenoid K11 and wiring. 4a. Check wiring continuity between battery (B+) and the start solenoid contact (BAT). 4b. Test starter, see engine service manual.
- Orion: 1. Replace the fuse with one of the same type and amp rating. If fuse FI blows again, refer to wiring diagram in Section 7 to locate short or defective component. 2a. Recharge or replace the battery. Specific gravity for a fully charged battery is approximately 1.260 at 80° F (27° C). 2b. Clean and tighten or replace the battery cable connectors and cables at the battery and the set. 2c. Adjust charge rate of battery charging circuit. Refer to Battery Charge Rate Adjustment in Section 6. 3a. Test Start / Stop / Test switch and wiring. 3b. Test solenoid K11 and wiring. 4a. Check wiring continuity between battery (B+) and the start solenoid contact (BAT). 4b. Test starter, see engine service manual.
Battery dead, CB11 circuit breaker issue, battery cable connection problem, B1 starter solenoid and motor issue, wiring issues between components
2 brands- Cummins/Onan: Check battery per Checkout [A] and recharge or replace. Check battery charger operation. If CB11 is okay, jumper battery cable B+ connection to 81 starter so- -no terminal. Check battery voltage present between K11 terminalS and ground with S11 in Start position. Test K11 per Checkout [D]. Check battery cables for clean tight connections (ref. Checkout [B]). Check B1 starter solenoid and motor: if bad, repair or replace. Check B+ wiring to S11, and between S11 and K11 . Check NC contacts of A 11-Ki 5 .. Replace if bad. Check B+ wiring between K11 and Bi sole- -no noid terminaL. Replace if bad. Check K1 I plunger travel for freedom to bottom in sole- -no id (necessary to open pull coil circuit).
- Doosan: Check battery per Checkout [A] and recharge or replace. Check battery charger operation. If CB11 is okay, jumper battery cable B+ connection to 81 starter so- -no terminal. Check battery voltage present between K11 terminalS and ground with S11 in Start position. Test K11 per Checkout [D]. Check battery cables for clean tight connections (ref. Checkout [B]). Check B1 starter solenoid and motor: if bad, repair or replace. Check B+ wiring to S11, and between S11 and K11 . Check NC contacts of A 11-Ki 5 .. Replace if bad. Check B+ wiring between K11 and Bi sole- -no noid terminaL. Replace if bad. Check K1 I plunger travel for freedom to bottom in sole- -no id (necessary to open pull coil circuit).
Open circuit breaker CB1 or CB
2 brands- Cummins/Onan: 1a. Check breakers. If open, locate and correct cause of overload. 2a. Clean and tighten all battery connections and the power unit battery connections. 3a. Check wiring continuity of the start - cranking circuit, refer to Figure 4-5. 3b. Test start/stop switch ($1). 3c. Test start relay (K5). 3d. Test start solenoid, see engine manual. 3e. Measure voltage to start relay coil with switch (S1) held in the Start position. If voltage is not present and continuity and battery check OK, cont. assembly (A1) is defective. 4a. Check wiring continuity between battery (B+) and the start solenoid contact (BAT). Refer to Figure 4-5. 4b. Test starter, see engine manual.
- Kubota: 1a. Check breakers. If open, locate and correct cause of overload. 2a. Clean and tighten all battery connections and the power unit battery connections. 3a. Check wiring continuity of the start - cranking circuit, refer to Figure 4-5. 3b. Test start/stop switch ($1). 3c. Test start relay (K5). 3d. Test start solenoid, see engine manual. 3e. Measure voltage to start relay coil with switch (S1) held in the Start position. If voltage is not present and continuity and battery check OK, cont. assembly (A1) is defective. 4a. Check wiring continuity between battery (B+) and the start solenoid contact (BAT). Refer to Figure 4-5. 4b. Test starter, see engine manual.
Insufficient battery voltage due to: a. Batteries not charged. b. Battery connections loose or dirty
2 brands- Cummins/Onan: 1a. Check breakers. If open, locate and correct cause of overload. 2a. Clean and tighten all battery connections and the power unit battery connections. 3a. Check wiring continuity of the start - cranking circuit, refer to Figure 4-5. 3b. Test start/stop switch ($1). 3c. Test start relay (K5). 3d. Test start solenoid, see engine manual. 3e. Measure voltage to start relay coil with switch (S1) held in the Start position. If voltage is not present and continuity and battery check OK, cont. assembly (A1) is defective. 4a. Check wiring continuity between battery (B+) and the start solenoid contact (BAT). Refer to Figure 4-5. 4b. Test starter, see engine manual.
- Kubota: 1a. Check breakers. If open, locate and correct cause of overload. 2a. Clean and tighten all battery connections and the power unit battery connections. 3a. Check wiring continuity of the start - cranking circuit, refer to Figure 4-5. 3b. Test start/stop switch ($1). 3c. Test start relay (K5). 3d. Test start solenoid, see engine manual. 3e. Measure voltage to start relay coil with switch (S1) held in the Start position. If voltage is not present and continuity and battery check OK, cont. assembly (A1) is defective. 4a. Check wiring continuity between battery (B+) and the start solenoid contact (BAT). Refer to Figure 4-5. 4b. Test starter, see engine manual.
Start solenoid (K1) not energized due to: a. Open in start - cranking Circuit. b. Defective start/stop switch. c. Defective start relay (IK5). d. Defective start solenoid (K1). e. Defective control assembly (A1)
2 brands- Cummins/Onan: 1a. Check breakers. If open, locate and correct cause of overload. 2a. Clean and tighten all battery connections and the power unit battery connections. 3a. Check wiring continuity of the start - cranking circuit, refer to Figure 4-5. 3b. Test start/stop switch ($1). 3c. Test start relay (K5). 3d. Test start solenoid, see engine manual. 3e. Measure voltage to start relay coil with switch (S1) held in the Start position. If voltage is not present and continuity and battery check OK, cont. assembly (A1) is defective. 4a. Check wiring continuity between battery (B+) and the start solenoid contact (BAT). Refer to Figure 4-5. 4b. Test starter, see engine manual.
- Kubota: 1a. Check breakers. If open, locate and correct cause of overload. 2a. Clean and tighten all battery connections and the power unit battery connections. 3a. Check wiring continuity of the start - cranking circuit, refer to Figure 4-5. 3b. Test start/stop switch ($1). 3c. Test start relay (K5). 3d. Test start solenoid, see engine manual. 3e. Measure voltage to start relay coil with switch (S1) held in the Start position. If voltage is not present and continuity and battery check OK, cont. assembly (A1) is defective. 4a. Check wiring continuity between battery (B+) and the start solenoid contact (BAT). Refer to Figure 4-5. 4b. Test starter, see engine manual.
Starter (M1) not energized due to: a. Open circuit between battery (B+) and the start solenoid contact (BAT). b. Defective starter (M1)
2 brands- Cummins/Onan: 1a. Check breakers. If open, locate and correct cause of overload. 2a. Clean and tighten all battery connections and the power unit battery connections. 3a. Check wiring continuity of the start - cranking circuit, refer to Figure 4-5. 3b. Test start/stop switch ($1). 3c. Test start relay (K5). 3d. Test start solenoid, see engine manual. 3e. Measure voltage to start relay coil with switch (S1) held in the Start position. If voltage is not present and continuity and battery check OK, cont. assembly (A1) is defective. 4a. Check wiring continuity between battery (B+) and the start solenoid contact (BAT). Refer to Figure 4-5. 4b. Test starter, see engine manual.
- Kubota: 1a. Check breakers. If open, locate and correct cause of overload. 2a. Clean and tighten all battery connections and the power unit battery connections. 3a. Check wiring continuity of the start - cranking circuit, refer to Figure 4-5. 3b. Test start/stop switch ($1). 3c. Test start relay (K5). 3d. Test start solenoid, see engine manual. 3e. Measure voltage to start relay coil with switch (S1) held in the Start position. If voltage is not present and continuity and battery check OK, cont. assembly (A1) is defective. 4a. Check wiring continuity between battery (B+) and the start solenoid contact (BAT). Refer to Figure 4-5. 4b. Test starter, see engine manual.
Battery dead, Fault light on, Loose wire or wiring error between K5 and the starter solenoid
1 brand- archive.org: Check battery per Checkout [A] and recharge or replace. See Checkout [C]. Check engine oil level, water level, etc. If okay, reset relay. Jumper battery cable B+ connection to B+ starter solenoid terminal. Check battery cables for clean and tight connections (ref. Checkout [B]). Check B+ starter solenoid and motor-if bad, repair or replace. With S10 in Start position, does Starter Relay K5 energize? Check Starter Relay K5, Start/Stop switch S10 and associated wiring and connection per Checkouts [D] and [F]. Check for loose wire or wiring error between K5 and the starter solenoid.
Is battery dead? Check CB11 circuit breaker. If okay, jumper battery cable B+ connection to B1 starter so terminal. Does engine crank?
1 brand- Cummins/Onan: With S11 in Start position, is battery voltage present between K11 terminal S and ground? If K11 does not energize, test per Checkout [D] and replace if bad. Is battery voltage present at B1 solenoid terminal with S11 in Start position? Check battery per Checkout [A] and recharge or replace. Check battery charger operation per Checkout [C]. Check battery cables for clean tight connections (ref. Checkout [B]). Check B1 starter solenoid and motor: if bad, repair or replace. Check B+ wiring to S11, and between S11 and K11. Check NC contacts of A11-K15. Replace if bad.
Open control fuse F
1 brand- Cummins/Onan: 1. Check the status of control fuse F1. If it is open, identify and address the reason for the overload. Replace the fuse if necessary. 2. Ensure sufficient pressure is applied to the Start/Stop switch S1 during cranking.
2a. Check condition of battery and recharge or replace. a. Battery not charged. 2b. Clean and tighten all connections at battery, K1 start solenoid, and starter motor. b. Battery connections loose or dirty. c. Battery cable size too small
1 brandStart solenoid (K1) not energized 3a. Check wiring continuity to the start solenoid (K1) coil from control assembly (A1) and from ground to start solenoid (K1). a. Open circuit to start solenoid coil. b. Defective start solenoid coil. 3b. Test start solenoid (K1). 3c. Test Start/Stop switch (S1). 3d. Measure voltage between start solenoid terminal I and ground with switch (S1) held in the Start position. If voltage is not present and continuity and battery check OK, control assembly (A1) is defective
1 brand