Question about 1994 Ford Bronco
50 amp fuse hot on ground side w/ key in on position
Check your wires to the starter and around the manifold they short easily if they rub on any surfaces
Posted on May 17, 2014
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Posted on Jan 02, 2017
Try disconnecting your alternator temporarily. It may have a shorted diode but that would also normally drain the battery too unless it charges over a relay.
The starter relay can't cause this alone and the currents through the ignition switch mostly control relays. If removing the alternator cable didn't work, I would remove the starter (only a few bolts) after disconnecting the ground cable from your battery and try turning it by hand. It should be stiff but not impossible and if it refuses to turn, it may have a short from the field to the case. It isn't really possible to use a multimeter to check the starter's windings because they are very low resistance when normal (the beast draws 120-200 amps to start) and would look like shorts on a standard meter anyhow.
Posted on Sep 27, 2008
Disconnect as many of the door switch wiring plugs, and wiring plugs for the seats that you can. Then, drop in a fuse. If it blows, you probably have a wiring issue, not a switch issue. If it doesn't blow immediately, reconnect the doors, and seats one at a time till the fuse does blow. Once it does, you've isolated your problem to a smaller area, and can replace / rewire that component.
If you've disconnected everything, and the fuse still blows, you probably have a wiring issue that will need to be traced. You will need a multimeter that can read ohms. You'll need to isolate different parts of the circuit (probably by unplugging and or cutting a wire in that circuit unfortunately) then use the multimeter to test the ohms from that part of the circuit to NON voltage side of the fuse holder. (If you try to test ohms on a hot circuit you will likely fry your multimeter!). If the meter reads low ohms, there is your short. High ohms (infinity) means there is no circuit, and there is no short. When you hit on something of low ohms, you've isolated the problem to a smaller area, and can keep tracing that wiring back to the fuse box to find your short.
Posted on Jul 25, 2009
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