Trailer Hitch Wiring 1993 Trans Sport

1993 TransSport 3.8L 400,000 km or 250,000 miles.
The forum is acting strange, won't let me search, si I will start a new thread. What is the best way; where is the best place to tap into the harness to wire a trailer electrical connector? Is there a towing package tap in the harness somewhere at the back?
A bunch of links to trailer hitch wiring appeared at the bottom of the page when I started this thread. I'll start reading while waiting for a reply.

Yes, GM did install a trailer hitch wiring harness, but my experience was it was very much a 'Wheres Waldo" search.
If in interpret the diagram, the trailer wiring harness should be located just behind the rear axle, favouring the passenger side. I hope it is on your van, because neither I nor the GM dealer could find it. Their suggestion was to open up the interior and tap into the main harness.
Once I pulled off the drivers sidewall, I found a 5or6 pin connector located about halfway back, around the vicinity of where the middle seats are. It had the running lights plus ground and a 12V source. I tapped into those wires, running them into the rear power compartment, where I could coil the wires and connector. This allows it to be stored without being damaged and feed the connector out through the rear hatch when needed
Edit:
diagrams did not show up unable to post them

Yes, GM did install a trailer hitch wiring harness, but my experience was it was very much a 'Wheres Waldo" search.
If in interpret the diagram, the trailer wiring harness should be located just behind the rear axle, favouring the passenger side. I hope it is on your van, because neither I nor the GM dealer could find it. Their suggestion was to open up the interior and tap into the main harness.
Once I pulled off the drivers sidewall, I found a 5or6 pin connector located about halfway back, around the vicinity of where the middle seats are. It had the running lights plus ground and a 12V source. I tapped into those wires, running them into the rear power compartment, where I could coil the wires and connector. This allows it to be stored without being damaged and feed the connector out through the rear hatch when needed
Edit:
diagrams did not show up unable to post them
Thanks for that. Did you find the brake/signal feeds there too? I will give that a go and then get back.

Yes, it had left brake right brake running lights ground and a 12V feed. It was too bad they didn't extend the harness a couple feet more so it could be accessed by just lifting the shock mount cover, but I guess the bean counters win again.
I will try to repost the diagrams again. If it doesn't work I will PM you with them

Yes, it had left brake right brake running lights ground and a 12V feed. It was too bad they didn't extend the harness a couple feet more so it could be accessed by just lifting the shock mount cover, but I guess the bean counters win again.
I will try to repost the diagrams again. If it doesn't work I will PM you with them

Diagrams came through. It looks like the trailer harness should be #12, just past the electronic load level controller (incidentally, I discarded the old non working compressor unit when I put the hitch on). I can't read what the connector number is for harness 12 ie Cxxxx?

According to the manual yes 12 is the trailer harness, but it just wasnt there on my van. Hopefully it might be there on the 1993 model

According to the manual yes 12 is the trailer harness, but it just wasnt there on my van. Hopefully it might be there on the 1993 model

I'll get back to it as soon as possible. I had to start soms work on an Impala.