wiring harness - Toyota FJ Cruiser Forum
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#1 (permalink) Old 05-23-2006, 03:13 PM
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wiring harness

Hooked up my wiring harness from toyota to the boat this past weekend.....and..... NOTHING!! No brake lights, no turn signals, no runing lights, NO ANYTHING!! i checked the fuse for towing in the engine compartment, but it is fine. The connections are 4 pins both on FJ and trailer.... any suggestions on what to do??
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#2 (permalink) Old 05-23-2006, 03:22 PM
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Re: wiring harness

1. Make sure Port guys plugged the 4 pin connector into the wiring harness on the FJ (this is different than trailer plugged to connector).
2. Use a volt meter to be sure there is a 12V signal to the 4 pin connector.
3. Be sure the ground pin is grounded.

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#3 (permalink) Old 05-23-2006, 03:23 PM
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Re: wiring harness

you have a test light? multimeter? do you get juice at the harness when you hit the break?

edit..

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Last edited by atreu59; 05-23-2006 at 03:29 PM.
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#4 (permalink) Old 05-23-2006, 03:27 PM
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Re: wiring harness

Did you install it yourself or was it factory installed? I noticed after i had installed mine that i didn't lock the wiring harness into the convertor under the dash good enough and it had fallen out. I hooked it back up and it worked fine. You may wanna make sure that they have the convertor plugged up under the dash.

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#5 (permalink) Old 05-23-2006, 03:52 PM
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Re: wiring harness

Thank guys Ill give those a try tonight --ill let ya know ( by the way --it was installed at the dealer)
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#6 (permalink) Old 05-24-2006, 12:46 PM
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Re: wiring harness

Ok , there is power coming from the fj harness (accordong to the meter) but no lights are working on the boat trailer. Tried hooking up the trailer to the other vehicle and the lights work fine WTF!!
The plugs on the fj and boat trailer are both the same (appear to be anyway) 1 ground and 3 prong..... Any ideas ?????
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#7 (permalink) Old 05-24-2006, 01:39 PM
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Re: wiring harness

Prongs wired the same?

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#8 (permalink) Old 05-24-2006, 01:45 PM
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Re: wiring harness

Quote:
voodooblue previously said:
Ok , there is power coming from the fj harness (accordong to the meter) but no lights are working on the boat trailer. Tried hooking up the trailer to the other vehicle and the lights work fine WTF!!
The plugs on the fj and boat trailer are both the same (appear to be anyway) 1 ground and 3 prong..... Any ideas ?????
First check to be sure that the fj tow hitch 4 pin connector ground pin is in fact grounded. Lights will not work unless there is a proper ground. Use ohm setting on multimeter (not volt meter) to ensure ground pin and frame give positive reading. I'm betting on this being the problem.

If grounding checks out, use a couple jumper wires (4 pin connector to boat trailer connector - one live and one ground) to be sure left turn signal in fj is sending to left turn signal on boat trailer. Right, and brakes to follow.

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#9 (permalink) Old 05-24-2006, 01:53 PM
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Re: wiring harness

thanks-- I'll try that
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