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Cadillac Repair/No start 1990 Cadillic Eldorado

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Expert: - 4/30/2011


Question
Hi Rob:
Getting back to you. I checked the ignition switch it appears to
be fine and no burn smell, although it was suggest that I
re-checked all the fuses. Under the hood there is a fuse box with relay and fuses. Two of the fuses 7.5 amp pertain to the injector harness. When I took them out to inspect them they were both them
blown, so I replaced them and and re-did the "noid" test and when I turned the ignition key as in crank the engine over the "noid"
light blinked on/off. So there is electrical current now. So my
problem may be solved. No sure what caused the 7.5 amp fuses to blow out to begin with. You relate to what caused the fuses to blow or short out? If the blow out again can I use a 10 amp in place of a 7.5 amp fuse?

Answer
Hello,

I commonly tell people to check both fuse panels because they usually don't know about the second. I do not know what would have blown both these fuses, but no, you don't dare throw in a 10 because you are defeating the use of a fuse. If there is something causing that circuit to blow, you will need to do diagnostics with a service manual. If you use a higher amperage fuse, you will end up with wire overheating and a subsequent fire and I don't think you want that.

Glad it worked out for now.

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Rob Painter

Expertise

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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