Turn signals and hazards not working

[HemiAlex]

Just noticed a few mins ago that nothing is working.

The 7.5a fuse has power and isn’t burnt.

The relay doesn’t sound like it’s broken. But when I pull the relay and check the terminals on the relay block, I don’t get any power.

I just ordered the relay as a spare. Is the turn signal switch the next most likely?

 

[g-man]

you could unplug the turn signal harness at the column under the dash and see if the G-R wire is feeding hot from the fuse. Next jump a wire to this connection while the plug is apart then activating the turn signal check the associated pins that send signal to those turn signal lights. Also check the grounds.

 

[OSS]

I believe the hazards and turn signals use the same flasher relay (guessing). Maybe just the relay fried.

 

[g-man]

bad flasher is the common denominator here.

 

[HemiAlex]

I’ve seen mixed reports as to what fails.

Would the relay fail open or closed? Some people report that either one or the other works or the lights will stay engaged instead of flashing.

 

[g-man]

in the diagram above the turn signal relays work the turn signals but haz switch goes straight to the flasher. Assuming the haz/horn fuse has power and there is power to the hazard switch...if the flasher isn't clicking most likely you just have a bad flasher.

 

[g-man]

When you say "the relay block terminals don't get power" did you mean the flasher switch terminals? did you try and turn the hazard switch on and see if that powers it?

 

[HemiAlex]

When you say "the relay block terminals don't get power" did you mean the flasher switch terminals? did you try and turn the hazard switch on and see if that powers it?

Yes. Still no power at that point.

 

[g-man]

Back to post #2, pull the turn signal/haz signal harness plug apart at the bottom of the column just under the dash, and test the incoming hot wires to verify you ARE getting voltage to the switch harness. Next jump across the open harness on those same hots and activate the switches and test the outgoing pins with a grounded 12v test light.

 

[HemiAlex]

It’s tough but i can’t diagnose til next weekend. By that time the relay from @cruiserjunktion should be here.

In 30,000 of daily driving this is only the 2nd time I can’t drive it. Not bad!

 

[madvr6]

It’s tough but i can’t diagnose til next weekend. By that time the relay from @cruiserjunktion should be here.

In 30,000 of daily driving this is only the 2nd time I can’t drive it. Not bad!

Why can’t you drive it?
You live in Houston and nobody uses turn signals here anyway.

 

[Michael Hanson]

Hi, I'm not sure turn signals are used in Texas any more. Mike

 

[HemiAlex]

This makes 5 jokes on the internet and in person.

Y’all got jokes.

 

[cruisermatt]

Did you check the main dash ground on the A pillar?
Maybe the switch is bad, but the switch can be bad for either the turn signals or the hazards and the other can still work.

 

[wiynwiyn]

I’m having the same problem as you. Replaced the flasher, Fuses. Should I check for ground and power going into the hazard, turn signal and flasher switches. I bought a new emergency hazard switch, will see what happens. My guess is there is a short somewhere or the turn signal failed so not sending signal to the flasher. Ls swap runs now but I can’t drive it since turn signal doesn’t works. Thanks all.

 

[BurntToast]

I’m having the same problem as you. Replaced the flasher, Fuses. Should I check for ground and power going into the hazard, turn signal and flashed switches. Ls swap runs now but I can’t drive it since turn signal doesn’t works. Thanks all. View attachment 3762649

I have a similar ish issue. When I hit the hazard the normal blinkers stop working.

Or just throw a BMW badge on and your good to go with no blinkers

 

[DrRock]

I have a similar ish issue. When I hit the hazard the normal blinkers stop working.

Or just throw a BMW badge on and your good to go with no blinkers

I'm convinced BMW sells the blinkers as an option here in the US. Just like their business model with heated seats etc. features and functions are present, one just has to pay extra to enable them.

 

[wiynwiyn]

From an engineering perspective, the turn signal won’t work if the hazard switch doesn’t work. Looks like power is running to the hazard switch then runs to the signal and flasher switches. My guess it’s a bad ground to the flasher or no power to the emergency switch. I will investigate.

 

[Spike Strip]

Don't know if this is your issue, but I can add that years ago I had the same symptoms on an '86 FJ60 and after replacing all the usual bits, I finally removed the Combo unit and I could see the Hazard switch had a nice big burn mark in it. Replaced the combo switch with a used unit and everything worked fine.

But it is common for the grounds to go bad on these old trucks.

 

[wiynwiyn]

Happy day in the Pacific Northwest. I checked for power and continuity from the fuse boxes to hazard light, and to the flasher. Had no voltage to the flasher so I was like what went wrong. Pulled the flasher and noticed the power prong broke off somehow. New used one was bent.