Rear Taillight issues
Thread Starter
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Cross-Country
Joined: Jun 2020
Posts: 54
Likes: 1
From: Tennessee
Rear Taillight issues
I have a 1988 F350 (7.3 IDI & ZF5) that I've about two months now.
I went to install aftermarket Taillights today, and license plate lights, Cause why not. I bought LED lights and reverse lights, as well as 3157 Adapters, and going by some diagram online, I hooked them up properly But I had no Brake lights or turn signals, only running lights. License plate lights work fine. Also 3 out of 4 of my fender marker lights are off.
All Fuses are good, I checked last night.
So if anyone could help me out, It'd be much appreciated. Thank you.
I went to install aftermarket Taillights today, and license plate lights, Cause why not. I bought LED lights and reverse lights, as well as 3157 Adapters, and going by some diagram online, I hooked them up properly But I had no Brake lights or turn signals, only running lights. License plate lights work fine. Also 3 out of 4 of my fender marker lights are off.
All Fuses are good, I checked last night.
So if anyone could help me out, It'd be much appreciated. Thank you.
Last edited by 7.3_4Life; Jun 19, 2020 at 09:08 AM. Reason: Fix spelling
Scope Wizard
Joined: May 2019
Posts: 6,530
Likes: 25
here is a good place to start..... Autolumination 3156 3157 4157 Selection, Troubleshooting and Installtion Tips
Logistics Pro
Joined: Sep 2007
Posts: 3,739
Likes: 181
From: Western Mass
3rd brake lights were'nt standard until 1994. They tried to get me on that when I was getting my truck inspected last year, I had to remind them it just has a cargo light so my truck cap doesn't need a 3rd brake light... (although I may add one some day?)
Check your grounds and make sure the bulbs are correctly inserted. LEDs are polarity sensitive, if hot and ground are reversed they don't light up.
Check your grounds and make sure the bulbs are correctly inserted. LEDs are polarity sensitive, if hot and ground are reversed they don't light up.
Thread Starter
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Cross-Country
Joined: Jun 2020
Posts: 54
Likes: 1
From: Tennessee
I figured out that my marker lights blew, 3 out of 4. So that's one thing. Running lights work fine, blinkers still don't work, and neither do the brake lights. I tried a new ground wire. Same thing, so Can we conclude it's the 3157 adapters yet?
Also the 4 way/ hazards work.
Also the 4 way/ hazards work.
Last edited by 7.3_4Life; Jun 20, 2020 at 10:49 AM. Reason: Fix words
Scope Wizard
Joined: May 2019
Posts: 6,530
Likes: 25
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Thread Starter
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Cross-Country
Joined: Jun 2020
Posts: 54
Likes: 1
From: Tennessee
All the fuses work, I used a test light, bulb came on for every one, and yes I tried with another bulb, the
incandescent one.
incandescent one.
Last edited by 7.3_4Life; Jun 20, 2020 at 01:12 PM. Reason: Spelling error
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Scope Wizard
Joined: May 2019
Posts: 6,530
Likes: 25
ok then is seems you have a Polarity issue with the LED bulbs if the incandescent work ... the guide website that I posted covers that issue.
Since I have no idea what diagram you are following for installation, I can't help you there.
Since I have no idea what diagram you are following for installation, I can't help you there.
Thread Starter
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Cross-Country
Joined: Jun 2020
Posts: 54
Likes: 1
From: Tennessee
I went by a YouTube video, this one to be exact:
And the adapter is setup by the following
Green - taillamp
Black - ground
Red - stop and turn
So in my case by the video it's:
black to black - ground
Brown to green - taillamp light
Red to (black with pink tracer, or green with orange tracer) it depends on what side.
Green - taillamp
Black - ground
Red - stop and turn
So in my case by the video it's:
black to black - ground
Brown to green - taillamp light
Red to (black with pink tracer, or green with orange tracer) it depends on what side.
Mountain Pass
Joined: Aug 2019
Posts: 190
Likes: 2
From: Racine County
I have a 1988 F350 (7.3 IDI & ZF5) that I've about two months now.
I went to install aftermarket Taillights today, and license plate lights, Cause why not. I bought LED lights and reverse lights, as well as 3157 Adapters, and going by some diagram online, I hooked them up properly But I had no Brake lights or turn signals, only running lights. License plate lights work fine. Also 3 out of 4 of my fender marker lights are off.
All Fuses are good, I checked last night.
So if anyone could help me out, It'd be much appreciated. Thank you.
I went to install aftermarket Taillights today, and license plate lights, Cause why not. I bought LED lights and reverse lights, as well as 3157 Adapters, and going by some diagram online, I hooked them up properly But I had no Brake lights or turn signals, only running lights. License plate lights work fine. Also 3 out of 4 of my fender marker lights are off.
All Fuses are good, I checked last night.
So if anyone could help me out, It'd be much appreciated. Thank you.
Scope Wizard
Joined: May 2019
Posts: 6,530
Likes: 25
I don't know what adapters are being used .... I know often you need to upgrade the flashers to solid state units and sometimes you can use resistors for hyper flash issues.
not all LED bulbs are created equal either
but IF you can get it to work with the Incandescent bulbs then it should function with LED providing you plug the bulb in with the proper polarity... there is 2 types of wiring STD and CK.on the 3157
not all LED bulbs are created equal either
but IF you can get it to work with the Incandescent bulbs then it should function with LED providing you plug the bulb in with the proper polarity... there is 2 types of wiring STD and CK.on the 3157
