turn signal fuse - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 6 (permalink) Old 06-18-2010, 09:59 PM Thread Starter
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turn signal fuse

my 20a turn signal fuse under dash panel keeps popping about once a day... any ideas? i figured a wire grounding out somewhere which will be a huge pita to trace, possibly the led tails doing it? or one of my buddies said maybe a relay is going bad or something causing it... input appreciated! im a religious turn signal user and its been killing me not using, been using emergency flashers if i have to turn left... and one time i friend a fuse panel from a fuse that kept blowing and ended up costin about $650 so i def dont want that to happen...

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post #2 of 6 (permalink) Old 06-19-2010, 04:52 AM
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If the fuse doesnt blow instantly when using the turn signals or brake lamps then its going to be a little difficult to trace. Since you mentioned LED tail lights I would start thinking about those first. Its possible that you pinched the wiring behind the lenses when mounting up the tail lights. You might try using the left or right turn signals one at a time and at least see if your problem can be trace to a particular side.

What you might try to do is....Since the fuse powers multiple circuits its rated at 20amps. You can down rate that fuse to try to pinpoint the circuit that blowing it. Turn signal bulbs alone dont need but a couple amps so maybe downgrade to a 10amp or 15amp fuse, then turn on the turn signals one side at a time and see if that shows anything.

Keep in mind that fuse also is for the brake lamps along with the flasher relay for the turn sigs. If you had a relay or switch problem I would suspect the lights would want to stay on, not blow a fuse. I have seen a few issues with the brake lamp switch wires rubbing things since the wire moves with the pedal it can rubb and ground out on the pedal bracket or something else near the switch. Unplug the brake lamp switch and check the connector for heat damage too. Brake lamp switch is mounted to the brake pedal above pad and where master cyl hooks up

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post #3 of 6 (permalink) Old 06-21-2010, 01:23 AM
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If 4 plays Idea does not work , what I do is, well I have a circuit breaker that I plug in, but you want to remove all the bulbs and inspect them and the mountings for damage or bent connectors. With all the bulbs out, Put on the brakes and see if the fuse blows, it could be the high mount brake light. I put a tool between the seat and the brake pedal with engine running. Then install the bulbs one at a time waiting about 30 seconds between if it is in a bulb the one that blows the fuse should be the bad one. Just a thought!

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post #4 of 6 (permalink) Old 06-21-2010, 04:49 AM
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the high mount brake light is on a differnt circut. same as the signal lights on the mirrors.

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post #5 of 6 (permalink) Old 06-21-2010, 01:40 PM Thread Starter
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ive got led mirror lights, 3rd brake light, and tails... make any diff? going to try out some of the ideas tonight! thanks guys!!

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2008 F250 CC SB 4x4 lariat dark stone, s&b intake, 5" flo pro straight pipe, 7" flo pro tip, sct livewire custom tuned by Eric @ IDP
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2001 F250 CC LB 4x4 xlt maroon lifted up
1997 F150 EC SB 4x2 xlt red
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post #6 of 6 (permalink) Old 06-21-2010, 04:50 PM
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What you want to do is remove as many posibilities as possible, then if you have a problem you know you have to start tracing back wiring or get some advise as to where the plugs are to disconnect the rear from the front wiring. That is above my pay grade. Just a thought!

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