Dim front side marker lights - The 1947 - Present Chevrolet & GMC Truck Message Board Network

howzzzit · 12-09-2023, 08:19 PM

My front side marker lights are dimmer than the rear. Bet it's a bad ground. The rear are grounded to the bed. Can't tell where the front are grounded as the wires are inside wire looms. Any idea where the factory ground for the fronts will be? It's the original wiring.
Thanks

howzzzit · 12-09-2023, 08:34 PM

Just read on an old post the front side markers ground through the parking lights. Is this so? I don't have my bumper and parking lights on the beast yet. Waiting for help with the bumper install.

LS short box · 12-09-2023, 09:54 PM

When I built my 68 I added extra grounds from the frame to the engine. Then from the frame to radiator support. I would add grounds from the box to the frame.

**truckster** · 12-09-2023, 11:36 PM

If you want flashing side markers they have to be wired through the turn signals.

howzzzit · 12-10-2023, 02:12 AM

Here's a post from 2009. They do go through the front parking lights. Problem solved.

**Richard** · 12-10-2023, 02:13 AM

69-70 are grounded direct and do not flash. 71-72 front side markers are grounded through the front turn bulb element. This makes them alternate flashing with the front turn lights. Because the ground is through the element LED's cannot be used in front turn or front side markers on 71-72. Even if a standard bulb is used in the front the resistance of the bulb will not allow an led side marker to light because it draws so little power.

howzzzit · 12-10-2023, 02:15 AM

Thanks Richard. We must have posted at the exact same time. And thanks Truckster.

**Rust_never_sleeps** · 12-10-2023, 03:16 AM

Wiring diagrams and manuals are available in pdf format here so you don't have to comb posts for this info:
https://67-72chevytrucks.com/vboard/....php?p=5781194

**Richard** · 12-11-2023, 02:46 AM

Quote:

Originally Posted by Rust_never_sleeps

Wiring diagrams and manuals are available in pdf format here so you don't have to comb posts for this info:
https://67-72chevytrucks.com/vboard/....php?p=5781194

The links to those downloads are all sorts of corrupted with spam now. I would not download anything from there. If there is a specific post that avoids this mess, please indicate which one.

howzzzit · 12-12-2023, 08:48 PM

Installed the front bumper and parking lights on the 72. AAARRRRGH! Anyway the front side markers are bright as day. Thanks for the help.

12-09-2023, 08:19 PM	#1
howzzzit Registered User Join Date: Dec 2005 Location: Kalifornia Posts: 308	Dim front side marker lights My front side marker lights are dimmer than the rear. Bet it's a bad ground. The rear are grounded to the bed. Can't tell where the front are grounded as the wires are inside wire looms. Any idea where the factory ground for the fronts will be? It's the original wiring. Thanks

12-09-2023, 08:34 PM	#2
howzzzit Registered User Join Date: Dec 2005 Location: Kalifornia Posts: 308	Re: Dim front side marker lights Just read on an old post the front side markers ground through the parking lights. Is this so? I don't have my bumper and parking lights on the beast yet. Waiting for help with the bumper install. Last edited by howzzzit; 12-10-2023 at 02:11 AM.

12-09-2023, 09:54 PM	#3
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 1,938	Re: Dim front side marker lights When I built my 68 I added extra grounds from the frame to the engine. Then from the frame to radiator support. I would add grounds from the box to the frame.

12-09-2023, 11:36 PM	#4
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,814	Re: Dim front side marker lights If you want flashing side markers they have to be wired through the turn signals. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

12-10-2023, 02:12 AM	#5
howzzzit Registered User Join Date: Dec 2005 Location: Kalifornia Posts: 308	Re: Dim front side marker lights Here's a post from 2009. They do go through the front parking lights. Problem solved. Attached Images

12-10-2023, 02:13 AM	#6
Richard Senior Member Join Date: Dec 1999 Location: Southern California Posts: 2,711	Re: Dim front side marker lights 69-70 are grounded direct and do not flash. 71-72 front side markers are grounded through the front turn bulb element. This makes them alternate flashing with the front turn lights. Because the ground is through the element LED's cannot be used in front turn or front side markers on 71-72. Even if a standard bulb is used in the front the resistance of the bulb will not allow an led side marker to light because it draws so little power. __________________ Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 Last edited by Richard; 12-10-2023 at 02:20 AM.

12-10-2023, 02:15 AM	#7
howzzzit Registered User Join Date: Dec 2005 Location: Kalifornia Posts: 308	Re: Dim front side marker lights Thanks Richard. We must have posted at the exact same time. And thanks Truckster.

12-10-2023, 03:16 AM	#8
Rust_never_sleeps Senior Member Join Date: Jun 2022 Location: San Ramon,CA Posts: 407	Re: Dim front side marker lights Wiring diagrams and manuals are available in pdf format here so you don't have to comb posts for this info: https://67-72chevytrucks.com/vboard/....php?p=5781194

12-12-2023, 08:48 PM	#10
howzzzit Registered User Join Date: Dec 2005 Location: Kalifornia Posts: 308	Re: Dim front side marker lights Installed the front bumper and parking lights on the 72. AAARRRRGH! Anyway the front side markers are bright as day. Thanks for the help.



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