Ask a Mechanic Online and Get Answers to Your Car Questions
my son has a 1973 plymouth satellite custom with the 318 engine. recently went to start and the red lead out of column had a meltdown.this lead goes into wiring harness and was factory fused together with 4 other wires.we found where a wire had grounded out in engine compartment,repaired that and thought fixed,but not.each time when we touch the red wire to wires in harness where it was connected in just the red wire gets hot. any idea on how to find/repair would be greatly appreciated. Thanks, XXXXX XXXXX
hi, my name is XXXXX XXXXX i'll be helping you today. welcome back to just answer!
your problem is relatively straight forward but will require some elbow grease to get it fixed.
first, you need to disconnect the battery so there is no chance of voltage passing through your meter.
you will need a common multimeter you can measure resistance with.
connect one lead of your meter to a good ground and then the other lead to to the wires in the harness where, when you try to connect the red wire it starts to get hot. you should find a closed circuit to ground at this point (leads level resistance).
once you have verified this, i would take each of the wires that are factory fused together at this point and cut one of them with wire cutters so as to disconnect it from the others. then check the resistance again. if the meter now shows an open then you have found the wire you need to trace out and find where it has contacted ground and fix that.
if the fused wires still show a connection to ground the problem is in one of the remaining wires. continue cutting one at a time until you have identified the bad wire and trace it out and fix it.
alternatively, you could cut each of the wires at the fused together point and test the resistance of each to ground. this may be better because there could be more than one of them now connected to ground because they got hot at some point.
once you have no connections to ground in any of those factory fused wires you will find you can connect them all back together with the red wire without the red wire getting hot. at this point you should be good to go!
i am going to jump out to q&a mode now so you can see the entire answer in one place. please let me know what you find. unfortunately, there really is no easy way to trace things like that without getting your hands a bit dirty!
Answer to question below did not help. The only wire showing to ground is the red lead from ignition switch and I’m not certain if it is supposed to show grounded or not. Please have ultratechone reply directly to this email address.Thanks, Bill