Marker Light Question…

[Flatwater]

My son is adding rooftop marker/clearance lights to his ‘79. How was the wiring for these ran? Is the windshield post hollow? Or does it go down the back corner of the cab and then up to the dash?

 

[Turbo4whl]

Yes the windshield post ("A" pillar) is hollow. Remove the driver's side sun visor, that will give you access to snake the wire down the post.

When you install the cab markers, make sure you place them where the factory markers are located. Then you can run the wire through the the hollow windshield top support.

 

[Flatwater]

Thank you!

 

[Craig 85]

Here's the wiring diagram. FYI on factory lights, the end lenses cant to the outside.

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[Flatwater]

Here's the wiring diagram. FYI on factory lights, the end lenses cant to the outside.

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Nice! Thank you!

 

[AuroraGirl]

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I have the old seals and covers from my truck(not this one) and this cab here probably has some harness (possibly..) but you are probably buying a kit I assume?

 

[Flatwater]

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I have the old seals and covers from my truck(not this one) and this cab here probably has some harness (possibly..) but you are probably buying a kit I assume?

For his pickup, he mounted a set of generic parts house lights. For mine, I picked up a set of Truck Lite 1313A’s. I’ll probably end up building harnesses for both. I like that pic, though. Shows good mounting orientation.

 

[AuroraGirl]

For his pickup, he mounted a set of generic parts house lights. For mine, I picked up a set of Truck Lite 1313A’s. I’ll probably end up building harnesses for both. I like that pic, though. Shows good mounting orientation.

In my opinion the original design of the seals is better, but the forward facing mounting of the lights is to be compliant with california and/or rear visible lights. A proper LED would get around the new seals but a incandescent will too

 

[Craig 85]

@AuroraGirl it's funny you mention California. We had so many crazy laws there. If you notice in the parts list above, there is a specific call out for Calif clearance lights. The state required any vehicle over 80" width had to have clearance lights. The thing that makes this truck require them is the Dana 60 front axle. Also no amber light is allowed to the rear. The solution is what you see below. These are my original covers with the black paint. My new lights are GM replacements that I still need to paint. Unfortunately I couldn't find any of the OEM black style. Those Truck Lite 1313A are very similar to the OEM ones.

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[AuroraGirl]

@AuroraGirl it's funny you mention California. We had so many crazy laws there. If you notice in the parts list above, there is a specific call out for Calif clearance lights. The state required any vehicle over 80" width had to have clearance lights. The thing that makes this truck require them is the Dana 60 front axle. Also no amber light is allowed to the rear. The solution is what you see below. These are my original covers with the black paint. My new lights are GM replacements that I still need to paint. Unfortunately I couldn't find any of the OEM black style. Those Truck Lite 1313A are very similar to the OEM ones.

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Does the rule cover turn signals?
Also, the seals design of the new marker caps would help keep any light from being visible since they point forward not straight up, if it were soomething to need more of. Also i would imagine internally painting if using an LED may help if that again was an issue

 

[Craig 85]

Does the rule cover turn signals?

No. There is a specific law that allows amber turn indicators facing the rear. Back in the early 90's a lot of Honda owner on our cruise route would swap the wiring for the amber turn signal and one of the brake/parking lights. You can't have amber brake light either. It was an easy ticket for me.

FYI that same clearance lamp law is why my truck also has lights on the tailgate.

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[JonBoyTN27]

Here's the wiring diagram. FYI on factory lights, the end lenses cant to the outside.

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Here's the wiring diagram. FYI on factory lights, the end lenses cant to the outside.

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@Craig 85 is there any info on the measurements or template to correct spacing etc of the cab roof clearance lights?

 

[Craig 85]

@Craig 85 is there any info on the measurements or template to correct spacing etc of the cab roof clearance lights?

I found a link to some GM diagrams. Here's a thread from another forum that explains it.

https://www.dieselplace.com/threads/square-body-cab-lights.690289/

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[SquareRoot]

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I have the old seals and covers from my truck(not this one) and this cab here probably has some harness (possibly..) but you are probably buying a kit I assume?

WTF? Lol. Lost for words

 

[JonBoyTN27]

I found a link to some GM diagrams. Here's a thread from another forum that explains it.

https://www.dieselplace.com/threads/square-body-cab-lights.690289/

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