Join Date: Apr 2011
Location: N.W. Alabama
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If your limited I would go the diode route. THe switch on the dash needs a hot wire on one side. The other side run a wire to the lights but before connecting it to the light connect it one side of a diode. the other side of the diode to the light. Now connect another diode to the light/diode point. Now connect the other side of this diode to the brake light. Done. Note with this method you wont be able to turn them off. They will still work with the brakes. It just gives you the option to turn them on at will.
All a diode does is act like a one way gate. You can walk through one way but not the other. Look at it closely and you sill see a band on one end. They should be tied together with both banded ends going to the light. The other side of one diode will go to the switch and the other diode loose end will go to the brake circuit. I don't know what size light you will be using, just be sure to get a diode that will handle the current.
As stated earlier you could also use a relay with your switch to switch between the two conditions. This will take 2 wires going up to the cab. One switched and one hot all the time. Also another wire to the brake lights. If you mount the realy at the light. If relay is mounted at dash you will need to get the brake wire up there.
So many ways, so many dicisions.
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