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Looks like you answered your own question..! You're right, the voltage is checked with the load applied. :D

Steelandcanvas is correct. This is the ground wire. Too many times a ground wire is omitted in truck to trailer pigtails in the hopes that grounding will be accomplished thru the fifth wheel, pintle hitch, trailer ball, etc. This almost always causes problems.

I do not have provisions for electric brakes on this truck. Here is a picture of the only pintle trailer that I own and it has air brakes. My conversion is by far the cheapest of all mentioned here, but would not be my choice if I did need electric brakes. The relay method would be the way I...

jwaller you are torturing 4trans!:-D "This is all you need" "I have no clue where to find one" :roll:

Yes all have air brakes. This mod was done to accomplish the same electrical circuits that are used on the macks that I have or any other civi truck for that matter. Thanks.

I dont know the rating. This resistor is an automotive item made to do exactly what I did with it. I experimented with different loads to establish the exact number of resistors needed. The trailer marker lights were the heaviest load so required the fewest resistors. Weird, huh? The more load...

O'reilly's is where I found them. Should last a lifetime unlike relays.

Thanks for the compliment. The resistors were $4.50 each and are permanent!!

I own six trailers that are pulled by two Mack trucks most of the time and the M818 occaisionally. Swapping bulbs are for people with one truck and one trailer combos. LED's are too expensive and are a favorite target of thieves.

I searched this forum more than once for the best method to pull civilian trailers with 12 volt lights. Never came up with ideas other than dead-end links, LED bulbs, 24volt relays and voltage convertors. This is what I did to get 12 volts to my trailers. If this setup has been thought of and...