Blowing ignition fuse repeatedly

Asked by Feb 21, 2015 at 11:45 PM about the 2005 Ford F-150 FX4 SuperCab 4WD

Question type: Maintenance & Repair

Have been told my cam sensors are bad, truck still runs just rough at 45mph and above.  Will bad cam sensors cause the ignition fuse to blow shutting the truck off.

2 Answers

102,325

No they are only pulse generators and don't have any real voltage from them. I would suggest you check the ignition switch first as Fords have a tendency to go bad and cross circuit, if the switch and plug look good no burn spots then, manually look over the engines wiring harness, look for any rubbed through wiring, loose engine grounds etc. if you still didn't find anything then I would install an amp gauge inline on the ignition circuit that is blown the fuse then perform the wiggle test on the harness while having someone watch the gauge, when the gauge jumps that is where the problem lies. This can get rather labor intensive so have patience. HTH

20,490

Tennis shoe steers you in the correct direction. Detecting the electrical problem in a vehicle where a fuse is blowing is no different than in a house. The problem comes in where the wiring in a vehicle looks like a spaghetti factory. To save time I suggest. Find a diagram of the electrical circuit for your ignition system, the problem is going to be there. Check the component associated to that particular fuse. Do the easy things first. Check the fuse box, in particular the connections to the ignition fuse. An arc at the prong connection could cause a fuse to blow.

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