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Location of Back Up Lamp and Battery Charge Relays in 1999 Ford F250 Super Duty  

Question:

1999 F-250 Superduty, I cant find the second smaller relay box on my truck, I only see the larger box, any suggestions? My truck has everything for the 7 wire harness except I cant find the two trailer relays.

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Expert Reply:

In my research, I managed to download a copy of the Owners Manual for the 1999 F250 SD. I found that the Trailer Tow Back Up Lamp Relay is in position # 38 and the Battery Charge Relay is # 39.

According to the diagram of the various locations in the power distribution box, location # 38 and 39 are not shown. The manual goes on to say that 38 and 39 are located in a smaller box that should be found adjacent to the larger box (closer to the brake master cylinder). I also found the same information mentioned in a few postings on some of the Ford Truck Forums.

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Mike L

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