Trailer Light Problem

I'm having problems with my 4-pin wiring for trailers. My left turn signal and is working but nothing else. No running lights brake lights or right turn signal. I seem to have a good ground and solid connections(continuity) to the converter box in the back of the cab. Anyone have some insight on this? If I get a manual does it show wiring for the trailer system? I also can't seem to find any fuses relating to the trailer wiring.

I have a 2004 Tacoma SR5 Double Cab.

 

Where did you get your trailer wiring? Tacomas (correct me if I'm wrong) have a separate bulb for the turn signal and brake light. Trailers (wired with 4-pin) share a bulb for the turn and brake. Therefore you need a converter.

$49 Hopkins Towing Solutions 43315 Plug-In Simple Vehicle Wiring Kit

http://www.amazon.com/Hopkins-43315-Plug-In-Simple-1995-2004/dp/B0002Q7ZKK
If this is what you have then please ignore this part.

Do you have any LED lights installed in your turn, brake, or running lights? These are not compatible with most trailer converters. I put an LED specific one on my truck once I converted everything to LED. I cannot remember which on it was off the top of my head but I will see if I can find it.

 

don't waste money buying those trailer light modulator thingy, they don't last long and every year or so (sometimes they last 2 yrs) then you need to buy a new one because they go bad so just use this solution:

http://www.tacomaworld.com/forum/lighting/347862-diy-easy-10-trailer-lights-plugin-fix.html

you will never have another trailer light problem for the life of the truck

 

Thanks for the info. Sounds like this will be a good long term fix.

 

Another question. Where is the module your referring to? From the diagram it looks as if you just splice and solder the diodes in directly behind the connector.

 

the module is something you buy to convert the Tacoma wiring to work the way trailer wiring works.

see it here: http://www.ebay.com/itm/TRAILER-HIT...ESS-/141633556843?hash=item20fa04916b&vxp=mtr

that black box between the trailer plug and the truck tail light plugs is the converter module

what I did was to just remove and replace the module with the diodes

the module is made with diodes and a transistor inside it and the transistor is what always goes bad on them. the transistor is useless and serves no purpose at all but its used like a fusible link instead. you already have fuse protection for your wiring so this transistor is just a weak point that makes the unit fail over time so you need to buy another one. it truly is built with parts designed to fail after a certain period of time so you buy another one. diodes never fail and last forever so if they built these with just diodes and no transistors in them then they would only be able to sell you one in your lifetime.