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You need a schematic for the circuits associated with the problem fuse. Disconnect all of the devices on that circuit and install the fuse. Then reconnect each device one by one and keep an eye on the fuse. When it blows you have the offender. If it blows with all the loads disconnected the problem is most likely in the wiring harness. I have made a fuse replacement device that uses a circuit breaker (aircraft type) set at 5 amps. I had to make it myself to find a problem exactly like yours. This procedure usually helps if you have some knowledge about electricity or electronics and how the wiring in the car is routed.
What devices are powered by fuse #12?
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I got too many cars!! Insurance eats me alive. Dave
78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
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