Question about Ford F-250

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WHY DON'T MY TURN SIGNALS WORK?

HAD MY MECHANIC (35 YEARS)AND AUTO ELECTRICIAN SPEND 2 HOURS TRYING TO FIND THE PROBLEM BUT, AFTER 2 HOURS HE THREW UP HIS HANDS AND SAID HE HAD NEVER RUN INTO A PROBLEM LIKE THIS. HE HAD THE DASH APART AND CHECKED EVERY WIRE AND FUSE FOR SHORTS AND ALSO CHECKED ALL LITE HOOK UPS AND THE NEUTRAL SWITCH ON THE TRANNIE AND ALL GROUNDS IN THE SYSTEM, AND FOUND NOTHING WRONG. BUT EVERY TIME YOU TURN THE IGNITION SWITCH ON IT BLOWS THE FUSE.HE HAS LESS HAIR NOW THEN WHEN HE STARTED. ANY IDEAS?? MIKE

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  • Ford Master
  • 2,913 Answers

At least it is a consistent short circuit - that is a big help. It is the intermittent faults that cause the most problems and take the most time.

The first question is what doesn't work when the fuse is pulled?
Whatever doesn't work must be supplied by that fuse, therefore the short circuit must be on one of those circuits.

The next step is to isolate each circuit from the others and test each in turn and that is the difficult part due to the common practice where the manufacturer makes splices within the wiring harness, that are impossible to find if you don't know they are there and a wiring diagram isn't always much help even though beginning such work without would be bordering on the foolhardy. Sometimes there is a little luck and two or three circuits are fed directly from the fuse so each wire can be snipped in turn.

Using a micro circuit breaker from a domestic fuse box would be cheaper than wasting lots of fuses, though I tend to use a headlamp bulb for a visual indication. When the bulb stops producing full brightness the fault is "cured".

In the old days when things were simpler, som of the less caring and more foolhardy would bridge the fuse holder and watch for smoke. That admittedly was a fairly quick and efficient method of finding a short circuit.
These days technology can help. A number of tool suppliers stock an electronic gadget for locating short circuits. I have seen them advertised but I have never used one. I believe the working principle is similar to the gear phone guys use that sends an RF signal into the wiring and a detector is moved along the wiring until the tone stops. More than that I cannot tell you other than I don't think they are impossibly expensive.
Check the link below...

https://www.youtube.com/watch?v=NC0YIk4Z85A

Posted on May 25, 2017

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SOURCE: Jaguar 2002 X-type - Engine dies - electrical problems

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SOURCE: 1991 lincoln town carTail lights and turn signals stopped working

One of the tail light bulbs can be shorted internally.  Replace the tail light bulbs first.  Try this cheap fix first.

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SOURCE: my 2001 chrysler sebrings dash lights flicker on

That should have a circuit board(which is probably cracked) that the lights plug into. Try to find one at a wrecking yard if you can. If not, pull yours out and have it checked for broken solder connections.

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SOURCE: I have a 1995 Toyota Corona 2000cc.Whenever i try

ignition or starter probable starter sylanoid

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jturcotte
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SOURCE: No brake lights. Problem is between brake light

Hi, diagrams are pasted below. I recommend you pull the signal switch out and troubleshoot the connector there. Please let me know if you have questions, and thanks for using FixYa.

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Posted on Jan 30, 2011

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