[jposes]

I have a front receiver hitch mounted fishing rod rack that I am putting spot lights on. I do not always have the rack mounted on my truck so I wired the lights up to a four prong plug (trailer type) so that it can be quickly connected and disconnected. I would like to tap into the fog lights so that the lights (when connected) will come when I turn on my fog lights. I tried to trace my fog lights wiring back but I lose it some where under the air cleaner box. Is there a terminal some where that I can tap into or do I need to continue trying to trace out the wiring for the fog lights?

 

[klhansen]

I'd be inclined to tap into one of the fog light wires in the vicinity of the battery (or behind the bumper) and run that to a relay. Power for your aux lights should come from a battery terminal, thru an appropriately sized fuse, and then thru the relay to your plug. Wire the relay to activate when the fog lights are on.

Even better would be a separate switch from a power source in the cab, with a wire running to that relay. That way you'd be able to switch your spots separately and not run into the possibility of overloading an existing circuit.

 

[jposes]

I think I may have overloaded the fog light circuit. I taped into one of the hots going to the fog lights and when I tried to turn on the fog lights the fuse blew. What type of relay are you referring to? I think I may try tapping into somewhere else or possibly running a switch. I didn't want to put a switch in since the lights are only available when I have the rod rack on my truck, but I may have to. I am thinking the Fog light circuit was overloaded blowing the 10amp fuse. I think the fog lights (after market) and the Hella's on my rod rack are all 55w so the four of them may be to much for the circuit.:icon_mad:

 

[blizzardwarrior7]

The fog lamp circuit is only 10 amps, thus any other lights you add to it will blow it...Adding a bigger fuse doesnt help either...First off, I find it hard to believe that those skinny little fuses can actually flow 20 amps, or even 30 amps, I don't buy it.
Your best bet is to put it on a seperate switch...Thats what I did.

 

[klhansen]

Look at this post for a relay wiring example.

http://www.thedieselstop.com/forums/f27/electrical-issues-224233/index2.html#post1713464