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Old 03-26-2010, 07:50 PM   #1
1973GMC_1500
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No turn signals, where to look?

I lost turn signals on my '87 K20 (just got it up and running w/ different engine last week). The fuse is good, I swapped the relay with a known good one, and I have power at the fuse block.

Any thoughts? I don't know of any underhood wires I could've messed up when I swapped the engine that would affect the turn signals.
I really don't want to tear into the steering column to replace the switch, been there, done that, it SUCKS.
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'87 GMC K2500 Factory 6.2 Diesel, 4 speed. Converted to 350 (has cracked block) converting back to 6.2
'82 [COLOR="Sienna"]Cadillac Coupe Deville 350 DIESEL
'93 Chev S10 2.8L 5 speed
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Old 03-26-2010, 08:13 PM   #2
flamingbig10
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Re: No turn signals, where to look?

check the junction box on the firewall, or the bulbs are bad
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Old 03-26-2010, 08:17 PM   #3
fixit-p
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Re: No turn signals, where to look?

Do your hazard lights work?
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Old 03-27-2010, 09:31 AM   #4
James McClure
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Re: No turn signals, where to look?

A quick question, did they work before the swap? Next, like mentioned above, do the 4 way's and brake lights work? Next, apply the 4 way's and step on the brake. Everything (all signal lights outside and dash indicators should light up) Release the 4 way's and keep the brake lights on. Signal left and see if the left rear light goes out, do same for right. All the above will check all the wireing for the signal light circuts EXCEPT B+ to the signal light switch and thats simple to check with a test light at the switch harnace connector. If you have all this, chances are pretty good the switch is bad. If you find a power loss check the fuse links. Hope this helps, Jim
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Old 03-28-2010, 10:07 PM   #5
1973GMC_1500
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Re: No turn signals, where to look?

I will check it out. The lights did work before the swap, but I don't remember exactly when they quit.
I don't think my brake lights work, I don't know if they ever did (never really noticed)

I'll run through a few of those tests tomorrow night if I have time.
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'87 GMC K2500 Factory 6.2 Diesel, 4 speed. Converted to 350 (has cracked block) converting back to 6.2
'82 [COLOR="Sienna"]Cadillac Coupe Deville 350 DIESEL
'93 Chev S10 2.8L 5 speed
'98 GMC K1500 Z71 ext cab shortbox 6.5 DIESEL
'96 Ford F250 7.3 Powerstroke
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