Cummins/Onan RGA-IN1 — Heater (Glow Plug) Relay Check (K13)
Testing & diagnosis · Heater relay K13
For the Cummins/Onan RGA-IN1, from the Cummins/Onan service manual.
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Procedure
- Connect relay coil voltage across relay coil terminals. Relay should activate.
- Connect voltage source to one side of relay contacts.
- Connect voltmeter to other side of relay contact and voltage source.
- If voltage appears when relay energizes, contact is good.
Tools required
- voltmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Cummins/Onan 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.