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My 2003 Ford F-350 keeps shorting out the exterior lamp fuse I already disconnected the trailer light assembly but it's still shorting out any answers?
Wiki User
∙ 14y ago
Kinda hard to explain an electrical issue but here we go!!! Ohms law states many things that doesn't get threw to alot of people it's very complex and hard to grasp. But once you get it, it becomes 2nd nature. Okay let's start the easy way. With electricity ONLY 4 things can happen. Short to ground, short to power,High resistance, and an open. With any and all electrical problems always resort back to those 4 rules. Now to explain, when you have a open something doesn't work. Blown fuse, broken wire, bad ground etc. High resistance and the most complicated one is when something kinda sorta works. Headlamps dim, wiper motor slow, slow power window operation, etc. Short to power is when something is always on. When you turn the headlamp switch off and the lights stay on, tail lamps stay on after removing from reverse, etc. And the last one and your question short to ground. Blowing fuses, melting wiring, blowing bulbs in extreme cases, etc. The easy way to explain is a power wire is touching a ground circuit. So chaffing, pinched wires, exposed wiring, etc. The easiest way I have found is to isolate sections of the wiring harness. Purchuse a decent manual and if it's exterior lights go to that section and find where it starts. If you can install a circuit breaker so you don't go threw 100 fuses. Then go down the line disconnecting connectors one by one checking the fuse affected each time until it doesn't blow. Then you have isolated it in that section of the wiring loom. That's how I do it and it works everytime. Hope this helps good luck and good hunting
Powerstroke 57
Wiki User
∙ 14y ago
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