Retrofitting trailer wiring on a 1997 Safari

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Bret Schmerker
I am merely driving my van
I am merely driving my van
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Retrofitting trailer wiring on a 1997 Safari

Post by Bret Schmerker » Sat Oct 27, 2018 8:11 am

For a 1997 GMC M11006, I've plans to fit a six-circuit isolator for the trailer wiring, so that any problems in the trailer not take out the van's lights in the process. I've ID'd all but two wires on the jack compartment stub harness (viz., 9 - 0.8 BR Tail Mrkr Lic; 18 - 1.0 YL, Left BT; 19 - 1.0 DGN, Right BT; 24 - 1.0 LGN, Back Up; 1642 - 2.0 OR, +Vcc UPFIT BAT; 1647 - 2.0 DBL, TRLR BRK DRIVE); only the 1.0 WH and 2.0 WH are yet to be identified in terms of the official General Motors circuit number table. Two connectors from Pollak are under consideration for the trailer receptacle: The 9-pin Fifth Wheel Utility Socket (P/N PK 12-907), and the 7-pin RV/Utility Socket (P/N PK 12-707E). :-k ...

In addition to ID's on the two white wires described above, would anyone have information on solid-state relays (not more than 35 A @ 12 VDC) suitable for the isolator and the sockets they would require? (My trailer set-up involves what is essentially a backport of the rear-body fuse and relay panel from the Chevrolet/GM City Express; the backport has ATM fuses for all trailer load feeds in the design.)
1997 GMC M11006 (Safari SLE, 2WD, V6-4300/4L60-E/7.625" 3.73:1 open)
Acquired Jul 2018 / Outfit in progress as of Nov 2018

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Re: Retrofitting trailer wiring on a 1997 Safari

Post by Astrophysics » Sat Oct 27, 2018 6:38 pm

Hi,

You may want to consider regular 20 A / 30 Amp relays. And also, your local RV trailer supply can order a 50 amp solenoid switch . No need for solid state relays.
Make sure to put fuses or resettable circuit breaker in charging lines. Also, put LED bulbs in trailer tail lights for low current draw.

AP

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