Caterpillar — Customer Device Problem
Testing & diagnosis · PRCM spare output / customer device
From a Caterpillar service manual — check it applies to your exact model before use.
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Procedure
- Check that the component or device is working properly.
- View the lower display to verify that K1 through K7 relay is activated.
- Use a multimeter to verify that the relay contacts are in the proper position.
Tools required
- Multimeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Caterpillar 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.