Turn signal

GFFR57

MEMBER
1973 FORD F-100
6.4L
V8
4WD
MANUAL
100,000 MILES

None of the turn signals or hazards work. Flasher is good. Brake lights and headlights all fine, Bulbs good, grounds seem fine. Could the turn signal switch have gone bad?

Thursday, January 7th, 2016 AT 6:31 PM

6 Replies

CARADIODOC

MECHANIC
33,916 POSTS

Does the heater fan work? If it doesn't, we have to go back before the fuse box.

Do the back-up lights work? If they don't, suspect a blown fuse. If they DO work, the fuse is okay, and that would point to a suspect signal switch or wiring associated with it.

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Thursday, January 7th, 2016 AT 6:45 PM

GFFR57

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24 POSTS

The heater fan and back up lights do work. Fuses all look good

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Thursday, January 7th, 2016 AT 7:00 PM

CARADIODOC

MECHANIC
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Check for 12 volts on one terminal in the socket for the flasher. If you have that, try a different flasher. The next suspect would be the signal switch.

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Thursday, January 7th, 2016 AT 7:10 PM

GFFR57

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24 POSTS

Ok ill try that. If that doesnt work what do I look for to fix that? I replaced the flasher already

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Thursday, January 7th, 2016 AT 7:18 PM

CARADIODOC

MECHANIC
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The next suspect would be the signal switch. The wiring diagram doesn't show the switches within the signal switch so I can't tell which wires should have voltage at which times.

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Thursday, January 7th, 2016 AT 7:33 PM

GFFR57

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24 POSTS

I pulled the steering wheel and tested the wires in the switch. The wire for the hazards works on the tester and it flashes appropriately (using a test light) however the exterior turn signal lights dont come on. All 4 wires that power each turn signal are dead. I didnt check the turn signal flasher yet

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Thursday, January 7th, 2016 AT 7:40 PM