My turn signals stopped working I have checked all bulbs?

Tiny
DAKOTAHFELL11
  • MEMBER
  • 1989 FORD THUNDERBIRD
  • 3.8L
  • V6
  • RWD
  • AUTOMATIC
  • 130,000 MILES
My turn signals stopped working iv checked all bulbs and thy are fine. When I turn the switch nothing happens my hazards do work but the light on the side of the car dose work but doesn't flash just stays on that only happens when the running lights are on other wise nothing works at all
Tuesday, January 27th, 2015 AT 5:23 PM

2 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,834 POSTS
When signals on both sides don't work, the first suspect is the flasher. There's usually two though, one for the signals and one for the hazard lights. That means typically only one system stops working.

Whenever you add a symptom where a lighting circuit acts differently when a second circuit is turned on, the running lights in this case, it's usually due to a bad ground. Not enough current can get through to cause the flasher to heat up and flash the lights on and off. Look for lights that aren't full brightness. A good approach to start with is to measure for voltage on the grounds of the rear bulbs. If yours still have the round brass bases, that's what you measure on. There must be 0.0 volts there when any lights are turned on. If you have the newer flat plastic bases, check on every terminal. With a bad ground, all four will have some voltage when any light is turned on.
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Tuesday, January 27th, 2015 AT 5:40 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 46,489 POSTS
Yep, the flasher can cause this, this guide can help you fix the problem as well please go over it.

https://www.2carpros.com/articles/turn-signals-not-working-blinker

Combination turn signal/hazard flasher is located to RH side of steering column opening reinforcement, mounted on a bracket.
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Tuesday, August 27th, 2024 AT 3:00 PM

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