What did you do with your truck today, take 2

[dsraven]

hey 47fasttoys, did you get the relay figured out? it shouldn't back feed through the relay for a ground unless there is a poor or non existant ground at the bulb socket and there is more than one circuit being used on the ground for that bulb. eg, if it back feeds through the back up light when you turn on the tail lights then check the ground for those 2 lights. easily enough done with a test light at the actual tail light bulb socket. just attach the test light alligator clip to a known good ground, turn on the tail lights and then touch the test light probe to the ground socket of the bulb. if the test light comes on, even dimly, then the ground for that light is poor. you may notice as well that the back up light is also trying to come on dimly. what is happening is the power goes through the element of the bulb and out through the ground circuit. since there is no ground it feeds back through the elements on the other bulbs using the same ground wire or ground location until it finds a bulb that will supply a ground. if you find this to be the case all you need to do is supply a good ground to that circuit and your troubles will probably go away. sometimes it can be a poor or non existant body ground. a body ground attached to a painted surface is not a good ground. from the battery there should be a large negative battery cable to the engine block, one battery cable to the frame, one (or two) smaller gage wires to the body (large enough to run ALL the accy options) and some guys will also run a battery cable from the frame to the engine as well.
hope that helps if you don't have it figured out already.