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Author Topic:   Trailer Lighting
AJT posted 07-11-2006 01:19 AM ET (US)   Profile for AJT   Send Email to AJT  
I have 1999 4Runner with the factory hitch and electical system. When I connect the trailer to the electrical connection the turn signals don't work, but the brakes do. Does anyone out there might have a clue of what is wrong.
Casco Bay Outrage posted 07-11-2006 12:58 PM ET (US)     Profile for Casco Bay Outrage  Send Email to Casco Bay Outrage     
I have a 99 4Runner LTD.

Do the turn signals on the truck work when the harness is connected? If not, problem is the converter on the truck.
If they do work, check the light harness pins with a tester.

Buckda posted 07-11-2006 09:56 PM ET (US)     Profile for Buckda  Send Email to Buckda     
Just trouble-shot the reverse problem on my trailer this past weekend. The turn signals and brake lights worked, but the running lights did not.

I was blowing fuses - so use a tester light on your fuses and figure out if everythign is good there.

If it is, you may have a problem with the converter.

If you have a blown fuse, you have a short somewhere.

Rather than hunt down the short, I simply rewired my whole trailer - took about 2 hours - but did find the short in the process (a charred bit of wiring on the left tail light of the trailer - vibration had chafed it through the plastic sleeve.

Good luck.


jimh posted 07-13-2006 08:45 AM ET (US)     Profile for jimh  Send Email to jimh     
If you vehicle has a lighting system where the turn signal lamps are separate from the brake signal lamps, you need a convertor to adapt this configuration to the trailer lighting where the turn signals and brake signals are the same lamp.
PeteB88 posted 07-13-2006 09:28 AM ET (US)     Profile for PeteB88  Send Email to PeteB88     
On my Camry, which requires a $20 converter, I found out, after about $40 bucks, that my trailer wires were rodent stripped causing a short(s) which blew a diode (potted in w/ epoxy) requiring new converter. If your vehicle requires a converter and you gotta short it will probably blow the diode (per my hitch man - Complete Hitch).

They use a battery charger to double check trailer wiring and lights before hooking up to any vehicle. Just get harness plug and attach the battery charger. They claim with experience their techs can determine if wires are shorted by how intense sparking is when they attach the charger.

I don't know about all that but I can assure you it is an effective and safe way to double check your wiring and connections w/o connecting to the vehicle and risking your electrical system.

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