Issues with turn signals! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

E.D.75GMC · 07-10-2017, 03:08 AM

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!

Pontiac1976 · 07-10-2017, 08:28 AM

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.

E.D.75GMC · 07-12-2017, 02:57 AM

Thank you. Ordered the necessary parts and I'll go through the grounds tomorrow.

**TKCR** · 07-12-2017, 02:55 PM

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

07-10-2017, 03:08 AM	#1
E.D.75GMC Registered User Join Date: Aug 2013 Location: Calgary Alberta Posts: 273	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! Attached Images __________________ Eric 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

07-12-2017, 02:57 AM	#3
E.D.75GMC Registered User Join Date: Aug 2013 Location: Calgary Alberta Posts: 273	Re: Issues with turn signals! Thank you. Ordered the necessary parts and I'll go through the grounds tomorrow. __________________ Eric 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

07-12-2017, 02:55 PM	#4
TKCR Senior Member Join Date: Oct 2014 Location: Ohio Posts: 6,980	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 __________________ FB Page for my Seats Belts https://www.facebook.com/73-87-Chevy...9439407476735/ Restoring Seatbelts: http://67-72chevytrucks.com/vboard/s...d.php?t=809750 SOLD My 86 Build:http://67-72chevytrucks.com/vboard/s...d.php?t=654972 Past Restored Bench Seats:http://67-72chevytrucks.com/vboard/s...d.php?t=715398 PayPal link to pay for your items: https://www.paypal.me/TKCR



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