The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Anyone Have LED Parking & LED Tail Lights??

**D.PASSMORE** · 10-28-2011, 10:42 AM

"The flasher has two prongs like the stock flasher. If the problem is caused by lack of a ground, I have no idea where the ground should go."

The ground (neg-)for the front flasher circuit is in the filment (wire inside the bulb-glows) on a original 1157 bulb - (two filments - park and brake/blinker). One of the filments go to ground (neg-) to the socket housing-which is grounded to body. All LED bulbs that I've seen does not provide that ground. So, no flash. Either you will need to find a LED bulb that has the internal ground or use the original type 1157 bulb - which has it...

BTW-I do use no-load flashers too.

When you finally get it right, its worth it. They light up much brighter and last alot longer than standard bulbs. I also use Hella H4 driving lights instead of the Halogens. Nice glow at night...

10-28-2011, 10:42 AM	#22
D.PASSMORE One of the First Join Date: Jan 2000 Location: St. Augustine,FL. Posts: 4,055	Re: Anyone Have LED Parking & LED Tail Lights?? "The flasher has two prongs like the stock flasher. If the problem is caused by lack of a ground, I have no idea where the ground should go." The ground (neg-)for the front flasher circuit is in the filment (wire inside the bulb-glows) on a original 1157 bulb - (two filments - park and brake/blinker). One of the filments go to ground (neg-) to the socket housing-which is grounded to body. All LED bulbs that I've seen does not provide that ground. So, no flash. Either you will need to find a LED bulb that has the internal ground or use the original type 1157 bulb - which has it... BTW-I do use no-load flashers too. When you finally get it right, its worth it. They light up much brighter and last alot longer than standard bulbs. I also use Hella H4 driving lights instead of the Halogens. Nice glow at night... Last edited by D.PASSMORE; 10-28-2011 at 01:41 PM.