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Old 04-18-2014, 07:11 PM   #1
Join Date: Feb 2014
Location: Havasu, AZ
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91 S-10 Chevy PU Toad Wiring

In the process of getting this old 91 S-10 set up for towing and was wondering,... Is it necessary to use diodes or can I just splice into the wiring?
Thanks, Jim

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Old 04-19-2014, 09:05 PM   #2
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Hello & Welcome Jim; to answer your question regarding the use of diodes. Yes you will need to use diodes. If not d/c power will back feed into the old S-10 which would not be good. I even had to use them on my 1960 CJ5 that had no power accessories at all.

Good luck.

Dave Fernandez
2001, 38ft FDDS, 350 ISC, Tow 2004 Yukon
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Old 04-20-2014, 04:32 AM   #3
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If you're planning to use the existing bulbs in the S-10 you will need to use diodes as Dave says to prevent power from back-feeding from the S-10 to the MH and vice versa.

If you don't want to cut into the S-10 wiring and use diodes, you can install separate light sockets in the tail light assemblies of the S-10 as an alternative. These will be wired to the MH only and will therefore not cause a problem with back-feeding of DC power. Kits are sold by Blue Ox, Roadmaster and others. Kits with LED lights are also available.
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