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Cadillac Repair/Electrical System is Dead

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Question
I have a 1978 Cadillac Seville. The entire electrical system is dead. The battery is new, had it tested to make sure; everything tests out good. Where would you recommend that I start to check things out further? Any help would be greatly appreciated. The car has had a problem with battery drain in the past.

Answer
Hello,

You are not giving me much to work with here. You state this car has had a battery draw for a yea. What did you do about it? Did you isolate the circuit when you knew you had this issue.
You need to purchase a factory Cadillac service manual for this car. Otherwise you are just guessing and wasting money on components that may have not nothing to do with the problem.

I will give you a couple ideas, but other than that, without being at the car with a factory service manual, it is impossible to expect an instant Internet fix, that is not going to happen.

You could check for a fusible link on the ed positive wire going into the back of the alternator. Then you can check the positive wires (not the battery cable) for blown fusible links. The way to determine if a fusible link is blown will be to pull on the wire. If it seems like rubber, you need to disconnect the negative battery cable, the positive battery cable, cut the fusible link leaving plenty of room for wire coming from eyelet, or you may have to replace that as well. Pars store have fusible link in bulk and can help you, if in fact that is the problem.

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Rob Painter

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Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?

Experience

Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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