Generac — Testing the Ignition System
Testing & diagnosis
From a Generac service manual covering: GN-190, GN-191, GN-320, GN-360. Check it applies to your exact model before use.
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Procedure
- Disconnect the high tension lead from the spark plug.
- Attach the spark tester clamp to the engine cylinder head (frame ground).
- Attach the spark plug high tension lead to the tester terminal.
- Crank the engine rapidly.
- If spark jumps the gap of the spark tester, the ignition system is operating satisfactorily.
- To check an engine miss, connect the spark tester in series with the high tension lead and spark plug, then start the engine.
Tools required
- Ignition tester (Generac P/N 0C5969) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.