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Cadillac Repair/99 etc starting and charging issues



I just purchased a 1999 Eldorado ETC from a guy who said it had a problem with the alternator not charging the battery. After getting the car home and digging into it a bit I noticed there was a wire running from the positive battery cable over to the fuel pump relay positive wire. When I remove the wire the vehicle will not start because the fuel pump is not engaged. if I hook the wire back up it starts again but the service charging system light comes on. Do you think it is possible that the wires in the column controlling the VATS could be causing the lack of power running to the fuel pump and also not allowing the alternator to charge when started with a jumper wire?


VATS has nothing to do with your issues. I guaranty this.

Here is how it is: There are two wires running to the positive side of the battery. Your main battery cable and another lead which has either one or two wires attached to the terminal. This wire(s) is for the control of the vehicle electrical system. One of these wires may lead to the alternator.

The ground side has the main cable and a separate wire(s) for body ground.

You need to check the output of the alternator either with an ammeter on the positive cable or a volt meter t the battery terminals. Should be no less than 13.2 volts.

Battery frame grounds go bad. Follow the neg cable to frame. Remove. Grind the frame and reinstall.

Let me know where you are at. None of this effects performance and you have some other event happening.  

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Rob Painter


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?


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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