Perkins — Glow Plugs - Test (Continuity)
Testing & diagnosis · Electrical system
From a Perkins service manual covering: 402D-05, 403D-07, 403D-11, 403D-15, 404D-22, 404D-22T, 404D-22TA. Check it applies to your exact model before use.
Applies to: Perkins 402D-05, Perkins 403D-07, Perkins 403D-11, Perkins 403D-15, Perkins 404D-22, Perkins 404D-22T, Perkins 404D-22TA
Procedure
- Connect a suitable test light between ground and the glow plug terminal farthest from the battery.
- Turn the starting aid switch to the ON position; the test light should turn on.
- Loosen the nut on each glow plug and disconnect the connectors.
- Use a digital multimeter to measure resistance between the glow plug terminal and ground.
- Connect the test light to the battery positive terminal and the glow plug terminal.
- If the light does not turn on, replace the glow plug.
- Install the connector on each glow plug and tighten the nut.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Maximum resistance 1.0 ohm for 402D-05 Amazon eBay $23.55 FridayParts $9.90, 403D-07 FridayParts $10.50 and 404D-15 Amazon eBay $61.75 FridayParts $9.90
- Maximum resistance 0.0139 ohm for 403D-11 Amazon eBay $28.64 FridayParts $9.90 SinoCMP $459.00, 403D-15 Amazon eBay $31.20 FridayParts $10.50 SinoCMP $129.00, 403D-15T FridayParts $14.80, 403D-17 FridayParts $19.35, 404D-22 Amazon eBay FridayParts $10.50 SinoCMP $129.00, 404D-22T FridayParts $15.00 SinoCMP $129.00 and 404D-22TA eBay $78.00 FridayParts $15.00 SinoCMP $289.00
- Maximum current 11 amperes; 8.5 amperes after 6 seconds (402D-05 Amazon eBay $23.55 FridayParts $9.90, 403D-07 FridayParts $10.50, 404D-15 Amazon eBay $61.75 FridayParts $9.90)
- Maximum current 110 amperes; 11.5 ± 1.5 amperes after 6 seconds (403D-11 Amazon eBay $28.64 FridayParts $9.90 SinoCMP $459.00, 403D-15 Amazon eBay $31.20 FridayParts $10.50 SinoCMP $129.00, 403D-15T FridayParts $14.80, 403D-17 FridayParts $19.35, 404D-22 Amazon eBay FridayParts $10.50 SinoCMP $129.00, 404D-22T FridayParts $15.00 SinoCMP $129.00, 404D-22TA eBay $78.00 FridayParts $15.00 SinoCMP $289.00)
- Voltage should not drop more than 0.5 volts
Full service-parts list: Perkins 402D-05 →, Perkins 403D-07 →, Perkins 403D-11 →, Perkins 403D-15 →, Perkins 404D-22 →, Perkins 404D-22T →, Perkins 404D-22TA →
Source: Perkins service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.