Update! I found that when I put the car in reverse it was drawing 39amps! After searching, I found that the back up wire at the trans had been rubbing on the pan and had grounded out causing the high amp draw and blowing the fuse. I repaired the wiring and all is good.

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1985 300D 296,000 miles - Project "Rusty" 1/4 mile in 19.9 sec @ 71mph. It's almost rust free and water proof!

2006 Dodge/Cummins 6-Speed - 670HP 1159ft/lbs