Blown fuses
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Senior User
Joined: Nov 2011
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Blown fuses
I have installed and wired cab lights on my f250 but each time I flip the switch it blows the fuse. Also after the first blown fuse I can't put in a new fuse without blowing it right away. I have used # 5,10,20, and 30 fuses. Why does this keep happening?
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
STOP!!! WTF? C'mon now.. The purpose of a fuse is to protect the circuit in case of an overload like a short to ground.
Troubleshoot the problem! - check all connections for loose/bare wires and double-check that the system is indeed wired correctly.
I'm gonna take a wild azz guess and say that one of the cab lights contacts is touching the sheetmetal or the mounting screws. Are you sure no wires are pinched ??
Troubleshoot the problem! - check all connections for loose/bare wires and double-check that the system is indeed wired correctly.
I'm gonna take a wild azz guess and say that one of the cab lights contacts is touching the sheetmetal or the mounting screws. Are you sure no wires are pinched ??
Cargo Master
Joined: Apr 2009
Posts: 3,038
Likes: 4
From: South west Idaho
Never over fuse or bypass a fuse if it keeps blowing ,sure sign of a short . If the wiring get's hot enough the truck can catch on fire. Same way a lot of house fires start, from being over fused.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
I have no idea. And neither do you, yet. All you have been doing is guessing. Figure out what the actual issue is first. This is what you were told to do earlier.
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Senior User
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Wel the Plate that the wire connects to also touches the bolt to the cab so that is the problem.
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Cargo Master
Joined: Apr 2009
Posts: 3,038
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From: South west Idaho
Try this, take all of the wires loose from all of the lights ,accept one and see if you can get it to work. If it does ,then wire the next one the same way, don't do any thing different. Then turn them on again,if they both work the go on to the next one ,testing as you go. If it shorts out ,then that's the one that's wrong, fix it. Then go on doing all the same wiring on all and they should work. Don't let your friends wire for you unless they know what they are doing.
Senior User
Joined: Mar 2005
Posts: 310
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Why would you think the light would be made so the hot wire would contact ground?
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
__Ahh, did we help or just hurt his feelings ? __
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