Originally Posted by Special Ed
got some flush mount trailer lights for my jeep, but they only have 2 wires green and black
i hooked the green to the green w/ stripe and black to white w/ black stripe
they work but when i turn the headlights on they dont come on?
turn signals work and so does brake lights...any ideas?
Does your new light have two bulbs or one? If it has only one bulb are there 2 elements inside that bulb? You need 2 elements whether they are housed in 2 bulbs or a single bulb to run everything. If you only have one total element, you are SOL.
Use a multi-tester or 12 volt test light to determine which Jeep wire belongs to what circuit. Turn on the parking lights and test those wires for power. Lets call the one with power brown (for the sake of this illustration). Lets call the one with power when the brake or turn signals are on yellow. If the Jeep has a black wire, it will be ground. Confirm this with a continuity test to the body or frame of the jeep. Some jeps only have a ground wire at one rear light. The other light is grounded by the mounting bolts in this case.
Check to see which light element is the brightest of the two elements. Conect the wire from that element to the Jeep wire that is hot when the brakes are applied. Connect the other light wire to the Jeep wire that is hot when the parking lights are on.
The black wire on your new light may be a ground. If so, you don't have enough wires or elements to run everything.