No turn signals! Need help - Vintage Mustang Forums
 
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post #1 of 11 (permalink) Old 07-13-2019, 09:59 PM Thread Starter
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No turn signals! Need help

I'm putting my car back together (1970 mach 1) and I cannot figure out why my turn signals are not working. I have headlights and tails. I have power to ONE side of the First flasher. I have replaced the both flashers and traced all the wiring for damage.

I also bought a replacement turn signal switch from CJ's (switch is a POS and does not engage the left signal cam. Read the reviews.. its going back).

Thoughts?

What I don't have plugged in, does it matter??
- Gauge cluster plug (using dakota digital)
- AC/heater stuff (using vintage air)
- wiper switch (don't have one yet)

Thank you

Last edited by ldouble619; 07-13-2019 at 10:11 PM.
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post #2 of 11 (permalink) Old 07-13-2019, 10:34 PM
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Did you add any non-stock Modern LED's to the car?!

If so, That's usually the issue nowadays...

)

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post #3 of 11 (permalink) Old 07-13-2019, 10:38 PM
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Fuse ok?
Does hazard lights work?

If you borrow a tool more than twice, you need to own it You get what you pay for!
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post #4 of 11 (permalink) Old 07-13-2019, 11:04 PM
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Make sure you're not over torqueing the steering wheel nut.
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post #5 of 11 (permalink) Old 07-14-2019, 08:21 AM Thread Starter
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Does the steering wheel need to be on? Right now its not. Anything else to check?

Do all the bulbs need to be installed and in the housings? I didn't think so on a 1970
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post #6 of 11 (permalink) Old 07-14-2019, 09:04 AM
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Do the brake lights work? If they do you have a problem in the turn signal mechanism. If you don't have enough bulbs installed the flasher won't operate.
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post #7 of 11 (permalink) Old 07-14-2019, 03:52 PM Thread Starter
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I put in all new bulbs. Still don't work. I'll hook up the brake light switch next.

Where are the grounds on a 1970?

I got one up front grounded to rad support. One under the dash grounded to the cowl. And one in the back tail lights ground to the battery.

Thanks
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post #8 of 11 (permalink) Old 07-14-2019, 05:16 PM Thread Starter
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Quote:
Originally Posted by awhtx View Post
Do the brake lights work? If they do you have a problem in the turn signal mechanism. If you don't have enough bulbs installed the flasher won't operate.

There is NO power at the brake line switch. There is power on one side of the first flasher.

thanks
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post #9 of 11 (permalink) Old 07-14-2019, 07:29 PM
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Power to the brake light switch comes from the headlight switch. Check for power coming out of the headlight switch.
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post #10 of 11 (permalink) Old 07-14-2019, 08:52 PM Thread Starter
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Awhtcx, thank you for your suggestion!

There is some whacking things going on.

With headlights ON - 10v to one side of the brake light switch
With headlights off - 0v

With headlights ON - right rear taillight lights brighter when turn signal is engaged. not the turn signal bulb but the brake light bulb.

Headlight switch is new from CJ pony.

Thanks
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post #11 of 11 (permalink) Old 07-14-2019, 08:59 PM
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Quote:
Originally Posted by ldouble619 View Post
With headlights ON - right rear taillight lights brighter when turn signal is engaged. not the turn signal bulb but the brake light bulb.

The rear bulbs are a dual filament 1157 bulb. One filament for taillight and the other filament for brake and turn signal.


Quote:
Headlight switch is new from CJ pony.

Don't buy anything other than a genuine Motorcraft switch.
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