Generac — Test 12 - Test Auto-Manual-Off Switch
Testing & diagnosis
From a Generac service manual — check it applies to your exact model before use.
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Procedure
- Disconnect wires from the switch terminals to prevent interaction.
- Set a VOM to its Rx1 scale and zero the meter.
- Connect VOM test probes across the listed switch terminal pairs.
- Actuate the switch to Auto, Man and Off and note the VOM readings (continuity/infinity).
- Reconnect all wires to the correct switch terminals before proceeding.
Tools required
- VOM Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Contacts 1&2: continuity only at OFF; 2&3: continuity at MAN/OFF; 4&5: continuity at MAN/OFF; 5&6: continuity at AUTO; 7&8: continuity at MAN/OFF; 8&9: continuity at AUTO
Source: Generac 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.