LED rear tail lights will not work with LED flasher? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72farmer · 09-03-2018, 04:54 PM

I am trying to get my new LED tail lights to work with no success. The LED's would work with flasher that was in the truck. But they were real slow and would finally quit after 10 seconds or so.
I bought a Grote 44891 LED flasher and ran the wire coming out of flasher to a ground like it was supposed to be. I can't get it to do nothing at all when blinker is on. The old flasher that was pluged in to the fuse block has to be wiggled around to work. I think the spade terminals that hold flasher in the fuse block are kinda worn and not holding/connecting flasher terminals. Could that be my problem (loose connection) or could I have a bad new LED relay? How could I check the relay?

bigbadchev72 · 09-03-2018, 08:27 PM

I had the same issue with mine, Had to make some small wire jumpers as the flashers are polarity specific. Basically had to flip the wires around if that makes sense? Need two wires with a male spade on one end and a female on the other of each wire. Then plug into fuse box and then plug into the flasher prongs

**clay68c10** · 09-04-2018, 07:04 AM

You may have to play with the polarity like bigbad said. It also looks like you have some corrosion in one of the terminals of the fuse box.

72farmer · 09-04-2018, 07:27 AM

Thanks, I will try that. I my have to dig into the wiring harness to find wires going to flasher and put new terminal on because of the corrosion.

Andy4639 · 09-04-2018, 03:54 PM

You also should have two flashers in the truck. 1 for turn signals 1 for emergency flashers. Make sure you replaced the right one. I would replace both myself. Mine came with a polarity piece that swapped them.

72farmer · 09-04-2018, 08:07 PM

Thanks that fixed it. But now the bottom verticle terminal on fuse block that holds the flasher is loose and correded. It is not holding the male spade wire terminal enough to make lights work. What color wire would that be in the harness? I am going to dig into the harness and find the 2 wires going to the flasher. Then crimp terminals on them and do away with the ones on the block. Please help.

firedemon · 09-04-2018, 08:26 PM

cut down a nail file the kind a woman uses , to clean the contact area (they do make specialty tools for this) . then take a small strait screwdriver and squish the terminal back together enough to be tight again and use dielectric grease to keep the corrosion at bay

Andy4639 · 09-05-2018, 03:46 PM

Take the screw out of the fuse block and clean the terminal up then reinstall it and make sure the connector is tight.

09-03-2018, 04:54 PM	#1
72farmer Registered User Join Date: May 2009 Location: Hazel Green AL Posts: 286	LED rear tail lights will not work with LED flasher? I am trying to get my new LED tail lights to work with no success. The LED's would work with flasher that was in the truck. But they were real slow and would finally quit after 10 seconds or so. I bought a Grote 44891 LED flasher and ran the wire coming out of flasher to a ground like it was supposed to be. I can't get it to do nothing at all when blinker is on. The old flasher that was pluged in to the fuse block has to be wiggled around to work. I think the spade terminals that hold flasher in the fuse block are kinda worn and not holding/connecting flasher terminals. Could that be my problem (loose connection) or could I have a bad new LED relay? How could I check the relay? Attached Images

09-03-2018, 08:27 PM	#2
bigbadchev72 People know me Join Date: Jun 2007 Location: Hermiston, oregon Posts: 840	Re: LED rear tail lights will not work with LED flasher? I had the same issue with mine, Had to make some small wire jumpers as the flashers are polarity specific. Basically had to flip the wires around if that makes sense? Need two wires with a male spade on one end and a female on the other of each wire. Then plug into fuse box and then plug into the flasher prongs __________________ 1972 k/5 blazer CST 4X4 Crate 350, th350/205, dana44with trac-loc/14 bolt with detroit locker, 4 wheel discs 4.56s, 8" suspension lift using 73-87springs, 1" zerorate custom front crossmember, HAD CV drivelines and driveshaft e-brake, full cage, PRP seats, Full autometer gauges, 38x14.5x16 Toyo M/Ts, 16x10 Polished aluminum rockcrusher wheels 1967 longbox 4x4, Strong 400/400/208, 44/12bolt 4.10s, 6" lift, 35" Toyo M/Ts on corvette rally wheels

09-04-2018, 07:04 AM	#3
clay68c10 Senior Member Join Date: Aug 2004 Location: Centennial, CO Posts: 2,991	Re: LED rear tail lights will not work with LED flasher? You may have to play with the polarity like bigbad said. It also looks like you have some corrosion in one of the terminals of the fuse box. __________________ ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ

09-04-2018, 07:27 AM	#4
72farmer Registered User Join Date: May 2009 Location: Hazel Green AL Posts: 286	Re: LED rear tail lights will not work with LED flasher? Thanks, I will try that. I my have to dig into the wiring harness to find wires going to flasher and put new terminal on because of the corrosion.

09-04-2018, 03:54 PM	#5
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: LED rear tail lights will not work with LED flasher? You also should have two flashers in the truck. 1 for turn signals 1 for emergency flashers. Make sure you replaced the right one. I would replace both myself. Mine came with a polarity piece that swapped them. __________________ 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.

09-04-2018, 08:07 PM	#6
72farmer Registered User Join Date: May 2009 Location: Hazel Green AL Posts: 286	Re: LED rear tail lights will not work with LED flasher? Thanks that fixed it. But now the bottom verticle terminal on fuse block that holds the flasher is loose and correded. It is not holding the male spade wire terminal enough to make lights work. What color wire would that be in the harness? I am going to dig into the harness and find the 2 wires going to the flasher. Then crimp terminals on them and do away with the ones on the block. Please help.

09-04-2018, 08:26 PM	#7
firedemon Registered User Join Date: Jun 2015 Location: @ Posts: 890	Re: LED rear tail lights will not work with LED flasher? cut down a nail file the kind a woman uses , to clean the contact area (they do make specialty tools for this) . then take a small strait screwdriver and squish the terminal back together enough to be tight again and use dielectric grease to keep the corrosion at bay

09-05-2018, 03:46 PM	#8
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: LED rear tail lights will not work with LED flasher? Take the screw out of the fuse block and clean the terminal up then reinstall it and make sure the connector is tight. __________________ 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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