Blinker quit working

[Gas Pig]

Out of the blue my buddy’s 73 blinkers quit working. The hazards work fine and the horn is also fine.

He said he tried a couple different flasher relays but still nothing. He even tried a new turn signal switch that he had planned on putting it in even before they quit.

Anyway I took a quick look and it doesn’t seem to be getting any power up to the switch besides the horn (larger yellow) wire. Unfortunately he doesn’t have a good wiring schematic of his truck.

Where is the power for the turn signal switch coming from?

 

[Chiclassics]

There should be two flashers one for hazards and one for turn signals.

See may be the turn signal flasher went bad? thats what feeds your turn signal switch. Start there and work your way further upstream (towards the ignition power)

 

[Gas Pig]

There should be two flashers one for hazards and one for turn signals.

See may be the turn signal flasher went bad? thats what feeds your turn signal switch. Start there and work your way further upstream (towards the ignition power)

Yeah he tried swapping both blinker relays and had a few spares to that he tried. Still without any luck.

The wiring under the dash is a bit of a mess. One of the prior owners added a radio or CB or something and tapped into who knows what.

He start with the wires feeding the flasher relay and see if there any 12v on either of them. Then if not then start looking up stream from there.

 

[DirtDonk]

The turn signals get their power through a fuse.
Check the fuse box.

 

[DirtDonk]

The initial power for the turn signals, before the fuse, comes from the Black w/green stripe wire from the back of the ignition switch.
However, if their heater, radio, and gauges all work, then that wire is intact.

 

[DirtDonk]

The hazard flasher is powered all the time.
The turn signals only have power with the key in the ON or ACC positions.
Figured you both know that, but in the heat of battle, we often forget to turn the key back on when testing something.

 

[Gas Pig]

The turn signals get their power through a fuse.
Check the fuse box.

Hey Paul, it was the fuse. The fuse was completely good but the factory fuse holder had just enough rust on it to quit making a good connection.

Thanks for everyone’s intput!
Jeff

 

[DirtDonk]

A win for the good guys!
Sounds like it’s time to pull all the fuses and clean the contacts.

We’ve talked about this for a long time now, where it’s a good practice to do it at least every other year. If not every year.

 

[Gas Pig]

A win for the good guys!
Sounds like it’s time to pull all the fuses and clean the contacts.

We’ve talked about this for a long time now, where it’s a good practice to do it at least every other year. If not every year.

Yes, that is the truth. Being an industrial electrician I have see a fair share of glass style fuse holders not making good contact with the fuse. The older and more exposed to moisture the more problematic they become. But if you keep on top them like mentioned, you avoid nuisance problems.

 

[Chiclassics]

Nice