Turn signals not working - Vintage Mustang Forums

 
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post #1 of 7 (permalink) Old 02-16-2013, 05:37 PM Thread Starter
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Turn signals not working

I just finished replacing the turn signal switch on my '68. Headlights, parking lights, brake lights, and emergency flashers are all working, but my turn signals are not working. I spent the extra money for a NOS switch, so I wouldn't think the switch should be bad, but I guess anything is possible. Turn signals were working before I replaced the switch. Any ideas?

1965 fastback - 289-4V, auto, deluxe interior, power steering, power brakes, air conditioning

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post #2 of 7 (permalink) Old 02-16-2013, 05:42 PM
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Seems to me that if the only thing you switched was the switch, and suddenly everything's not working, that's what I'd suspect. I'd swap out the old switch and see what happens.

"Natalie", '66 Coupe, aka "Jinx", "Jinxie Natalie" (everything goes wrong..)
289, Holley Carb, Edelbrock Intake/Water Pump, Northern Rad
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post #3 of 7 (permalink) Old 02-16-2013, 06:16 PM Thread Starter
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Here's some additional info to help with troubleshooting. The part number of the switch I installed is C8ZZ-13341-A. The part number of a lot of the other switches I have seen listed is C8SZ-13341-A. Any concerns here? I thought "Z" was for Mustang and "S" was for Thunderbird. The service numbers on the tags for my old and new switch are the same.

1965 fastback - 289-4V, auto, deluxe interior, power steering, power brakes, air conditioning

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post #4 of 7 (permalink) Old 02-16-2013, 06:26 PM
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Question #1... with the ign switch OFF and your foot on the brake, does flipping the switch turn OFF the brake light on that side?

If the answer is YES, that means the switch is doing it's job of interrupting the brake light signal so it can flash the t/s.

Question #2 - With the ign switch ON, does flipping the switch turn on the corresponding indicator lamp on the dash?

If the answer is "YES", then you definitely have something going on with the switch as the indicator lamps are piggybacked on to the front lamp circuit. You probably don't have any contact between the switch and the rear contacts. It could be as simple as moving the column a bit closer to the wheel.

If the answer is "NO", then I would do a basic circuit check to make sure that one of the two terminals of the t/s flasher plug has voltage with the key "ON". If not, check the t/s fuse - you could have inadvertently blown it while installing the switch if you had the key "ON".
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post #5 of 7 (permalink) Old 02-16-2013, 08:10 PM Thread Starter
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Quote:
Originally Posted by bartl View Post
Question #1... with the ign switch OFF and your foot on the brake, does flipping the switch turn OFF the brake light on that side?
YES

Quote:
Originally Posted by bartl View Post
Question #2 - With the ign switch ON, does flipping the switch turn on the corresponding indicator lamp on the dash?
NO

Quote:
Originally Posted by bartl View Post
check the t/s fuse - you could have inadvertently blown it while installing the switch if you had the key "ON".
The fuse is good

1965 fastback - 289-4V, auto, deluxe interior, power steering, power brakes, air conditioning

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post #6 of 7 (permalink) Old 02-17-2013, 06:41 PM Thread Starter
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I still have the brand new repro turn signal switch and harness connector that I bought for this repair before I decided to go NOS instead. Maybe the easiest way to troubleshoot this is just attach the new repro switch to the harness connector and plug it in. This should be a valid test for any other issues even without installing the switch in the column, correct?

1965 fastback - 289-4V, auto, deluxe interior, power steering, power brakes, air conditioning

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post #7 of 7 (permalink) Old 02-23-2013, 05:13 PM Thread Starter
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Update on my troubleshooting efforts - I installed my Daniel Carpenter reproduction turn signal switch today and my turn signals work fine. Turns out the NOS switch I bought was bad.

1965 fastback - 289-4V, auto, deluxe interior, power steering, power brakes, air conditioning

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