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Believe it or not, that's a typical problem that happens from time to time. It doesn't happen "often enough to make the troubleshooting charts" but.....
Typically, the DC auto reset Mini Breakers on the trailer tongue bulkhead and the couple of blade type DC breakers that are in the fuse panel "just get weak springs" and start opening a little below the rating (after a couple of years)...
Don't toss the old mini-breaker... If you ever have an electrical issue and can't find the cause for blowing 15 amp fuses, you can just plug that circuit breaker into the fuse slot rather than buying "boxes and boxes" of 15 amp "one time use" fuses to help you troubleshoot the problem.... I've got a couple that I keep in my tool box, just for troubleshooting DC wiring issues....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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