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Troubleshooting Trailer Running Light Circuit Fuse that Has No Voltage

Question:

am not finding any juice at the trailer running light fuse.i have brake and turn signals but no running lights.

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Expert Reply:

If the fuse of your trailer running light circuit does not have power running to it then that would indicate that there is a bad relay associated with that circuit. If you check the diagram for the fuses/relays on your vehicle's fuse box there should be a section that has the relays listed and the associated circuits.

The easiest way to test a relay for being bad is to replace it with a known working relay. If it works at that point then you know it was the relay.

expert reply by:
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Jameson C

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