Turn Signals Not Working

[Danadj]

Tail lights work fine including brake lights. Flashers don't work but when the switch is on, the turn indicators in the cluster both light up. Also, when the brake is pressed and the brake lights are on and the turn signal is put to the left or right the corresponding brake light goes out. Any help is appreciated.

 

[pcf_mark]

I would suspect your turn signal switch. Key on, foot off the brake gently put the turn signal on and put a little sideways or front/rear pressure and hold to see if signal starts to blink.

 

[Danadj]

I would suspect your turn signal switch. Key on, foot off the brake gently put the turn signal on and put a little sideways or front/rear pressure and hold to see if signal starts to blink.

It is a relatively new switch but I'll check it out.

 

[DirtDonk]

New or old, no longer matters. They can be bad right out of the box.
But the first thing I would do would be to check the flasher units themselves. You said the hazards don’t work either? Are you sure you have both circuits connected to their flasher relays?
Maybe you can borrow a known good one and plug it into either location to see what, if anything changes.

 

[Danadj]

No luck on wiggling the switch. Just to clarify, when the flasher switch is on the brakes are applied, the cluster turn signal lights come on, When brakes are let off, they go out.

 

[DirtDonk]

What your (oops, I meant “year”) bronco?
Factory original harness, or aftermarket replacement?
Stock steering column and turn signal switch?
Integrated flasher switch on the column, or on the dash?

 

[Danadj]

No luck on wiggling the switch. Just to clarify, when the flasher switch is on the brakes are applied, the cluster turn signal lights come on, When brakes are let off, they go out.

New or old, no longer matters. They can be bad right out of the box.
But the first thing I would do would be to check the flasher units themselves. You said the hazards don’t work either? Are you sure you have both circuits connected to their flasher relays?
Maybe you can borrow a known good one and plug it into either location to see what, if anything changes.

I replaced the signal switch after I got the truck and it worked fine for a while then stopped then started but lately nothing. Changed the relays with no results. I recently replaced the 3 Spd with a NV3550 and I just pulled and cleaned up the column to convert to PS so I'm quite sure the pins are in the right place and making contact. Just can't seem to find problem with the turn signals.

 

[Danadj]

I replaced the signal switch after I got the truck and it worked fine for a while then stopped then started but lately nothing. Changed the relays with no results. I recently replaced the 3 Spd with a NV3550 and I just pulled and cleaned up the column to convert to PS so I'm quite sure the pins are in the right place and making contact. Just can't seem to find problem with the turn signals.

 

[Danadj]

What your bronco?
Factory original harness, or aftermarket replacement?
Stock steering column and turn signal switch?
Integrated flasher switch on the column, or on the dash?

Steering column is stock and wiring harness is stock, I removed shift linkage and cut the original shaft to replace with the collapsible shaft. The flasher is the stock dash switch. this issue began before the column modification, I was just hoping disconnecting and reconnecting everything would make a difference.

 

[Brush Hog]

Try adding a good ground wire from dash to firewall. That fixed my similar problem. Those turn signals and flashers are very finicky to grounding issues.

 

[Danadj]

Try adding a good ground wire from dash to firewall. That fixed my similar problem. Those turn signals and flashers are very finicky to grounding issues.

Will do once I'm back home. Thanks,

 

[Danadj]

I did some testing at the fuse box with ignition on there is power to the turn signal fuse but no power to the Emergency flasher fuse. On the wiring diagram the power source wire (Black-Yellow stripe) for the flasher appears to be coming from the alternator

 

[Oldtimer]

BK/Y wire feeds fuses for emergency flasher (20A), and courtesy lamp (15A) thru headlight switch.
The headlight switch ALSO gets power for headlights from BK/Y wire from alternator.

If the headlights work, you have 12V all the way to the internal splice in the harness, that feeds both fuse block and headlight switch.
This splice also contains the Yellow wire that feeds ignition switch. It appears splice is good.

I would suspect the connection between BK/Y wire and bus bar (rivet) in fuse block that feeds both fuses, or the contacts in fuse holder are corroded.

68 & 69 fuse panel are same.

 

[DirtDonk]

You should be able to pull the ashtray out of the dash and see the back of the fuse panel pretty easily. Maybe a little flashlight and wire brushing action could help. Or at least let you see if one of the wires or buss bars has become deteriorated or disconnected.

 

[Oldtimer]

Paul,
What year did fuse panel move to glovebox? He's working on a 69.

 

[DirtDonk]

You’re right! I caught that in your last post but it didn’t register.
That change would’ve been somewhere between 70 and 71 when it moved to the glove box.
So the fact that it’s a 69 makes it even more likely that your scenario is correct and that the fuse panel needs a little love. Might even disconnect the battery and pull the fuse panel off the floor/firewall and have a good close look.

 

[DirtDonk]

Not to mention, making it even more important to check the two firewall connectors.
All of this discussion isn’t really zeroing in on the issue perhaps, but it’s still important.

 

[Danadj]

I took the fuse panel off the firewall and the Blk-Yel striped wire had broken off at the back terminal because of corrosion. I've cleaned the end of the wire and the terminal plate and now I have to figure out the best way to reattach it. Maybe soldering? I'm open to ideas, definitely don't want to reinvent the wheel.

 

[DirtDonk]

Can you upload a picture of the break? Once you clean up the end of the wire, is there enough of it to reach? There wasn’t a lot of excess under there being in such tight quarters.
Glad you found the issue at least. Soldering would make the most sense, but it’d be nice to see the culprit.

 

[Danadj]