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Author Topic:   Hidden Fuses on 2004 TOYOTA TACOMA For Trailer Lighting Circuits
topgunfs posted 08-09-2009 04:44 PM ET (US)   Profile for topgunfs   Send Email to topgunfs  
If you find one or all of your trailer lights won't work [when connected to a 2004 Toyota TACOMA], there is a seperate fuse system for factory trailer set-up's behind the driver-side rear seat under the black converter box. It is not shown in the manual.

There are four fuses labeled RIGHT, LEFT, TAIL, and POWER. The fuse for TAIL is only 5-Amperes, and may not be enough for a trailer with running lights. --THOM

jimh posted 08-09-2009 05:08 PM ET (US)     Profile for jimh  Send Email to jimh     
Thanks for the information about the undocumented and out-of-the-way location of the fuses for the trailer lighting circuits in a 2004 Toyota TACOMA. Since the circuit is fused at 5-Amperes, it is probably not a good idea to replace the 5-Ampere fuse with a larger value.

A trailer will typically have four lamps for running lights. There are typically two (red) tail lamps, and two side or obstruction (yellow) lamps. With a 5-ampere rating and a nominal 12-volt system, that allows 60-watts of incandescent lamps.

The typical tail lamp uses an 1157 bulb. The running lamp portion of the filament typically is only an 8.4-watt bulb. I suspect that the side lights use a bulb with a similar rating. That adds up to 4 x 9 = 36-watts total for the typical trailer running lights. A 5-ampere fuse (60-watts) should be plenty to operate the trailer running lights.

If you have a trailer with more side lights or if you use multiple tail lights, you might run into a problem with the 5-ampere fuse. Otherwise, it ought to be plenty to keep the trailer running lights illuminated.

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