Trailer Lighting for Coach Without Factory Trailer Lighting Option
- Thread starter tyler
- Start date
Corey,
As the salvage coach that is stored here has a trailer hitch, It probably has the plug in trailer harness. If you care, I will look when I have time.
What you probably don't if there is no trailer harness, is the blue wire to the front for brakes or whatever.
Matt
> There's plenty of info out there but most of it seems to be related to coaches that have the factory trailer harness. Ours does not (at least it
> does not have that RPO in the glove box and I don't see any additional wiring inside the LR tail light access or along the rear frame rail). Is
> there a guide on how to tap into the existing chassis circuits the "right" way? The driver side plastic panel is off right now so it's an ideal time
> to attack this.
--
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
As the salvage coach that is stored here has a trailer hitch, It probably has the plug in trailer harness. If you care, I will look when I have time.
What you probably don't if there is no trailer harness, is the blue wire to the front for brakes or whatever.
Matt
> There's plenty of info out there but most of it seems to be related to coaches that have the factory trailer harness. Ours does not (at least it
> does not have that RPO in the glove box and I don't see any additional wiring inside the LR tail light access or along the rear frame rail). Is
> there a guide on how to tap into the existing chassis circuits the "right" way? The driver side plastic panel is off right now so it's an ideal time
> to attack this.
--
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
Matt,
I think I'm going to stick with either surge brakes or brake buddy. Not too concerned with the blue wire. I'm really just concerned with lighting. I'm
going to take one more good look in the LR taillight access to make sure there are no surprises in there.
--
Corey P /
Hilliard, OH /
1974 Glacier 26' /
3.70 FD /
ION Wheels
I think I'm going to stick with either surge brakes or brake buddy. Not too concerned with the blue wire. I'm really just concerned with lighting. I'm
going to take one more good look in the LR taillight access to make sure there are no surprises in there.
--
Corey P /
Hilliard, OH /
1974 Glacier 26' /
3.70 FD /
ION Wheels
I THOUGHT I did that and did not see anything in there a few weeks ago but I'm going to give one last look today. I do not have the trailer lighting
option listed in the glove box. Is it normal to have the harness even without that option from the factory?
--
Corey P /
Hilliard, OH /
1974 Glacier 26' /
3.70 FD /
ION Wheels
option listed in the glove box. Is it normal to have the harness even without that option from the factory?
--
Corey P /
Hilliard, OH /
1974 Glacier 26' /
3.70 FD /
ION Wheels
It is a plug that is actually a bit lower then the drivers rear tail light. like almost floor level....accessed from inside. what year coach??
almost a T like deal if I remember right, and had to take that plywood apart a little to really gain good access to it. T's off the harness in that
corner and the wires for trailer lighting should exit the body in that corner.
if it is truly not there, it is just a matter of tapping into the correct wires at that rear corner. (3 wires. Left turn, right turn, and a tail
light). Brake lights are the same wire as the turn signal wires- just go brighter when you hit the brakes. 4th wire(white), is just a ground, you
want to make sure that is tied well to chassis. you can buy kits off amazon, or most stores that supply trailer wiring. -
https://www.amazon.com/CURT-58040-4-Way-Connector-Socket/dp/B001GN1M7K/ref=sr_1_2?dchild=1&keywords=trailer+wiring+vehicle+side&qid=1615928308&sr=8-2
always buy a good wiring kit. There are some from like harbor fright, that have think jacket wires and thin copper inside.
--
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
almost a T like deal if I remember right, and had to take that plywood apart a little to really gain good access to it. T's off the harness in that
corner and the wires for trailer lighting should exit the body in that corner.
if it is truly not there, it is just a matter of tapping into the correct wires at that rear corner. (3 wires. Left turn, right turn, and a tail
light). Brake lights are the same wire as the turn signal wires- just go brighter when you hit the brakes. 4th wire(white), is just a ground, you
want to make sure that is tied well to chassis. you can buy kits off amazon, or most stores that supply trailer wiring. -
https://www.amazon.com/CURT-58040-4-Way-Connector-Socket/dp/B001GN1M7K/ref=sr_1_2?dchild=1&keywords=trailer+wiring+vehicle+side&qid=1615928308&sr=8-2
always buy a good wiring kit. There are some from like harbor fright, that have think jacket wires and thin copper inside.
--
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
OK So I went back to the LR taillight access and actually did some pulling and this came out. It does appear the blue wire is present.
http://www.gmcmhphotos.com/photos/data/7357/medium/20210316_185748.jpg
As Jon said above, I guess it's just a matter of tapping into the right wires based on the wiring diagram??
http://www.gmcmhphotos.com/photos/data/7357/medium/Screenshot_20210317-011401_Drive.jpg
--
Corey P /
Hilliard, OH /
1974 Glacier 26' /
3.70 FD /
ION Wheels
http://www.gmcmhphotos.com/photos/data/7357/medium/20210316_185748.jpg
As Jon said above, I guess it's just a matter of tapping into the right wires based on the wiring diagram??
http://www.gmcmhphotos.com/photos/data/7357/medium/Screenshot_20210317-011401_Drive.jpg
--
Corey P /
Hilliard, OH /
1974 Glacier 26' /
3.70 FD /
ION Wheels
