Generac — Testing Regulator-Rectifier
Testing & diagnosis · Alternator
From a Generac service manual covering: EVT-04629-0, EVT-04629-1, EVT-04717-0, EVT-04797-0. Check it applies to your exact model before use.
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Procedure
- Using a digital multimeter, test battery voltage with engine NOT running.
- With charging system connected, start the engine.
- Bring engine to normal operating speed and test battery voltage again.
- If running battery voltage is greater than stopped voltage, the charging system is working.
Tools required
- Digital multimeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Battery voltage should be at least 13 Volts with engine running
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.