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Trailer wiring harness


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After purchasing a hitch from Krustyballer I needed to add trailer wiring. My major hold up was I didn't want to cut into the factory wiring. So I started looking for preterminated connectors. I was able to find both sides available from ACDelco among others. 

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PT454 is the male end.

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PT222 is the ACDelco number, I bought a S1056 from Standard. I bought both on eBay for $15 each. They have now both gone up to about $40 from what I can find. Then Minuit suggested Mouser Electronics. They have both connectors available in individual pieces.

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This is the page for the female connector.

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The page for the male connector.

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The page for the seals you will need for both connectors.

If you want to make the harness you will need.

12048074 x 3

12052139 x 2

12059472 x 1

12052486 x 1

12052200 x 1 

12052199 x 1

12045773 x 3

12052172 x 2

12048086 x 6

12048443 x 4 had to buy from eBay 

12059168 x 4

That shopping list will build both connector ends.

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For my first one I started with the S1056 and added the Mouser parts to the other end.

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I then soldered in a 4 way connector. I wanted to be able to switch it the trailer connector ends if it gets mangled or corroded. I also plan on using this end that I will drill a hole in the bumper to mount. It should look like it belongs there.

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I then coated the solder joints in liquid electrical tape.

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This stuff works quite well.

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Wrapped the new harness in electrical tape.

 

 

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Added convoluted tubing and a tee for protection.

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One more wrap of black tape to keep the junk out.

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This is the junction the new harness goes between.

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Harness installed.

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Wired the trailer wiring to the other side of the 4 way connector.

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Harness to run from the new harness to the trailer wiring. With the additional connector in there the trailer end is easily replaceable.

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Taller wiring ran to the hitch for now.

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Bought this little tester for $7 and everything works!

 

 

Here is a video of the testing.

I have now made to if these and both work. I'm going to make one more beacuse I ordered plenty of parts from mouser. I know have trailer wiring and didn't cut the factory harness. If I ever run into problems with my lights I can just remove the harness and go back to stock if needed.

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The second one ended up much shorter. The last one I make I think will be even shorter.

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Here is a description of what each wire does.

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Left to right top row of wired are for lights. Bottom row left is ground.

By terminal is easier to use when all your wires are gray.

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A is blue in the truck and is for the taillight. Brown on trailer wiring.

B is brown on the truck and RH turn signal. Green in the trailer wiring.

C is gray with a tracer on the truck and LH turn signal. Yellow on the trailer wiring.

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E is black on the truck and ground. White on the trailer wiring.

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Second harness I made is much shorter. I like the fit better.

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This is why I added the extra four way connector. I already changed the trailer end to one that mounts in the bumper.

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Looks almost factory. I really like that it's out of the way. The best part is that it was $4 on Amazon!

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Ready to be used!!

 

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1 hour ago, olddude said:

2 different gauge wires, what are they?  

I'm guessing 12 and 18 gauge. Not 100% sure the word were in the connectors when I got them. The larger matches some 12 gauge I had paving l laying around. The smaller wire is just a little bit smaller than the 16 gauge I have laying around so I would guess 18.

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On 1/29/2020 at 12:54 PM, JMO413 said:

I'm guessing 12 and 18 gauge. Not 100% sure the word were in the connectors when I got them. The larger matches some 12 gauge I had paving l laying around. The smaller wire is just a little bit smaller than the 16 gauge I have laying around so I would guess 18.

 

Thanks, good write-up I plan to do this soon.

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On 1/30/2020 at 6:28 PM, JMO413 said:

Welcome. Glad I could help.

 

Well, I completed this project today. Piece of cake, even for a old fart. I ordered all the parts from the shopping list from Mouser Elec. except the seals. Ordered seals from eBay. Had to get 50 of each, so if anyone needs seals I have plenty. Works great!

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2 minutes ago, olddude said:

 

Well, I completed this project today. Piece of cake, even for a old fart. I ordered all the parts from the shopping list from Mouser Elec. except the seals. Ordered seals from eBay. Had to get 50 of each, so if anyone needs seals I have plenty. Works great!

Awesome! Glad it was of use.

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