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Old 07-10-2017, 03:08 AM   #1
E.D.75GMC
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Issues with turn signals!

Hello everyone, over the past couple years I've slowly been converting all the lights on my '75 GMC over to LED. It's at the point now where every single bulb has been replaced with an LED, with exception to the headlights. They've been great and really make the truck pop at night time but ever since I put LEDs in the front turn lamps I've noticed that the signal lights slow down and eventually stop flashing when you're stopped at a red light at night with the headlights on and whatnot. Now they've always slowed down a bit when coming to a stop, but I figured that was just because of the old school non-relay light system. I installed 50 Ohm resistors in parallel with the front turn lamp LEDs as the per instructions and I'm wondering if that's perhaps too much resistance? Or should I swap the mechanical flasher relay out for an electronic unit? And would adding relays for the headlights help as well? I should mention that the truck also has a 100 amp alternator and cab clearance lights (LED) wired in to the headlight switch at the dash. Any advice is appreciated, thanks!
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1975 GMC High Sierra C25 105,000 original miles
1989 Camaro IROC-Z 180,000 Kilometers
1996 Chevrolet Cheyenne K1500 323,000 Kilometers and still going strong
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Old 07-10-2017, 08:28 AM   #2
Pontiac1976
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Re: Issues with turn signals!

Quote:
should I swap the mechanical flasher relay out for an electronic unit? And would adding relays for the headlights help as well?
yes that should help but make sure all grounds are good.
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1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed
Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change.
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Old 07-12-2017, 02:57 AM   #3
E.D.75GMC
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Re: Issues with turn signals!

Thank you. Ordered the necessary parts and I'll go through the grounds tomorrow.
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1975 GMC High Sierra C25 105,000 original miles
1989 Camaro IROC-Z 180,000 Kilometers
1996 Chevrolet Cheyenne K1500 323,000 Kilometers and still going strong
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Old 07-12-2017, 02:55 PM   #4
TKCR
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Re: Issues with turn signals!

Had the same issues after changing a bunch of my bulbs over to LED's. Ended up just keeping the interior led bulbs, but the exteriors I went back to the originals. I got all new exterior bulbs, but went back with the standard bulbs. Just had too many weird issues. Here's a thread on the subject:

http://67-72chevytrucks.com/vboard/s...d.php?t=663228
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