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I have a 1997 Ford F350 7.3. The truck has a western bed with a 7 pin rv plug. Just recently I lost power to the black wire, powering the aux. brake battery supply. Can anyone tell me where/if there is a fuse or relay under the hood that supplies power to this wire?
 

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Check fuse #5 a 15 amp fuse and #18 a 30 amp maxi fuse in the under hood fuse box.

#5 is for the Backup Lamps, Daytime Running Lamps (DRL), Trailer Battery Charge Relay

#18 is for the Trailer Battery Charge Relay
 

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Also remember that the key needs to be in the run position for power to the trailer wiring.
 

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It may be similar to these diagrams, but follow the link in the caption to be sure:

 
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