Jump to content

Recommended Posts

Hello again everyone. I am back again requesting help on my 1985 Mack R600ST dump truck.

VIN 1M1N179YXFA099577

This time I am in need of some assistance with wiring up some new LED tail lights. 
I have ran a new 7 wire bundle from the 14pin junction block on the driver side firewall. There is also a 4 wire bundle that is ran from the same block but from different pins and I suspect that it is original to the truck. The issue I’m running into is I couldn’t find any lights that didn’t use the Red wire as a stop/turn multifunction wire. So that’s what I had to use. 
 

I will attach some pictures of the wire ends coming from the 4wire original to the truck and to the new LED tail lights, along with the wire diagram for the LEDs. 
There is also what I have wrote down from testing with a test light. Green from the 4 wire may be reverse but I can’t get that feature to work at the moment.  

The diagram is correct except I have a blue wire in place of the yellow. 
 

Thanks in advance 

IMG_2997.png

IMG_2998.jpeg

IMG_3003.jpeg

IMG_3006.jpeg

Edited by Jizzo17
Added info
Link to comment
https://www.bigmacktrucks.com/topic/75061-r-model-tail-trailer-light-wiring/
Share on other sites

  • Jizzo17 changed the title to R Model Tail & Trailer light Wiring

https://acrobat.adobe.com/id/urn:aaid:sc:VA6C2:8514a9b0-d0b5-4f41-b644-5b8fb227c70e

 

If i'm understanding you correctly. You ran a seven wire cable from the firewall junction block to the rear end of the truck frame.

 

My R model. only needs 4 wires to the rear of the truck

Screenshot_20250123_192947_Adobe Acrobat.jpg

1 hour ago, Jizzo17 said:

Hello again everyone. I am back again requesting help on my 1985 Mack R600ST dump truck.

VIN 1M1N179YXFA099577

This time I am in need of some assistance with wiring up some new LED tail lights. 
I have ran a new 7 wire bundle from the 14pin junction block on the driver side firewall. There is also a 4 wire bundle that is ran from the same block but from different pins and I suspect that it is original to the truck. The issue I’m running into is I couldn’t find any lights that didn’t use the Red wire as a stop/turn multifunction wire. So that’s what I had to use. 
 

I will attach some pictures of the wire ends coming from the 4wire original to the truck and to the new LED tail lights, along with the wire diagram for the LEDs. 
There is also what I have wrote down from testing with a test light. Green from the 4 wire may be reverse but I can’t get that feature to work at the moment.  

The diagram is correct except I have a blue wire in place of the yellow. 
 

Thanks in advance 

IMG_2997.png

IMG_2998.jpeg

IMG_3003.jpeg

IMG_3006.jpegminal 

The left turn in your 4 wire should also be a stop light. Someone has it hooked to the wrong terminal up on the firewall, or maybe the switch is bad. It sounds like it's hooked to the same terminal as the left turn on the hood. 

JH2.jpg

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...