Flashing side markers - bug or feature? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

davepl · 07-15-2014, 10:14 PM

Put in new flashers today, went around to make sure everything works, and see that my front side marker lights flash with the signal lights (on that side only).

The also flash when the 4-way flashers (Hazard lights). They work whether the park/headlights are on or off (meaning even when on, they still blink off for the off state).

The rear side markers do nothing other than light up with park/headlights.

My 2010 Range Rover does that too, and even if not intended I'd like to keep it, but did they do that in 1970?

All my other vintage cars are 69 or earlier, and they definitely don't.

**KevsClassics** · 07-15-2014, 10:53 PM

Feature. They are working exactly how they are supposed to.

**FirstOwner69** · 07-15-2014, 11:20 PM

Not all trucks had front side markers that flash. My 69 did not have lighted markers, just reflectors. I decided I wanted them to light. Rather than ordering a new harness or merely splicing wires, I stripped harnesses from several trucks in the junkyard and noticed the harnesses were different. I did some searching on this forum and found a thread or two that stated that not all front marker lights flash. The wiring I used in the front merely has a positive wire running out of, and molded into, the back side of the the parking light socket with the marker socket at the opposite end. This arrangement lights the markers but does not flash them. I don't have the other harness here to check the difference in how it's wired. I think one of the other threads stated that when GM first put the lights in, they did not flash. I don't recall if that thread stated that the change to flashing lights was a mid-year change or model year change. Unfortunately, I did not pay attention to what years I stripped the various wiring from. I actually wanted mine to flash...

Here's a link to a thread where we discussed it.
http://67-72chevytrucks.com/vboard/s...d.php?t=503138

And another.
http://67-72chevytrucks.com/vboard/s...d.php?t=455493

Andy4639 · 07-16-2014, 01:46 AM

Mine is a 71 Custom Deluxe and they flash up front but not out back. This is how they came from the factory. It was a opition in 69-70 and in 71 they came standard on all models I think to operate like this.

07-15-2014, 10:14 PM	#1
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Flashing side markers - bug or feature? Put in new flashers today, went around to make sure everything works, and see that my front side marker lights flash with the signal lights (on that side only). The also flash when the 4-way flashers (Hazard lights). They work whether the park/headlights are on or off (meaning even when on, they still blink off for the off state). The rear side markers do nothing other than light up with park/headlights. My 2010 Range Rover does that too, and even if not intended I'd like to keep it, but did they do that in 1970? All my other vintage cars are 69 or earlier, and they definitely don't. __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

07-15-2014, 10:53 PM	#2
KevsClassics TILT COLUMN GURU Join Date: Dec 2006 Location: FRESNO CA Posts: 4,276	Re: Flashing side markers - bug or feature? Feature. They are working exactly how they are supposed to. __________________ Instagram kevs_classics64 64 Impala SS Conv 72 Blazer 2wd 75 Jimmy 2wd 63 Belair wagon 02 Silverado ext cab. DD RIP EL JAY

07-15-2014, 11:20 PM	#3
FirstOwner69 Senior Member Join Date: May 2010 Location: Wisconsin & Arizona Posts: 4,844	Re: Flashing side markers - bug or feature? Not all trucks had front side markers that flash. My 69 did not have lighted markers, just reflectors. I decided I wanted them to light. Rather than ordering a new harness or merely splicing wires, I stripped harnesses from several trucks in the junkyard and noticed the harnesses were different. I did some searching on this forum and found a thread or two that stated that not all front marker lights flash. The wiring I used in the front merely has a positive wire running out of, and molded into, the back side of the the parking light socket with the marker socket at the opposite end. This arrangement lights the markers but does not flash them. I don't have the other harness here to check the difference in how it's wired. I think one of the other threads stated that when GM first put the lights in, they did not flash. I don't recall if that thread stated that the change to flashing lights was a mid-year change or model year change. Unfortunately, I did not pay attention to what years I stripped the various wiring from. I actually wanted mine to flash... Here's a link to a thread where we discussed it. http://67-72chevytrucks.com/vboard/s...d.php?t=503138 And another. http://67-72chevytrucks.com/vboard/s...d.php?t=455493 Last edited by FirstOwner69; 07-15-2014 at 11:40 PM.

07-16-2014, 01:46 AM	#4
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: Flashing side markers - bug or feature? Mine is a 71 Custom Deluxe and they flash up front but not out back. This is how they came from the factory. It was a opition in 69-70 and in 71 they came standard on all models I think to operate like this. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.



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