Aboutautohelp Expertise On hands professional expertise in all aspects of Cadillac diagnostics and repair mid 1970`s thru 2000 year vehicles. GM certified in electronic fuel injection, Automatic transmission, Heating and A/C, and onboard vehicle computer diagnostics.
Experience Held over 15 GM certifications prior to retirement in 1989.
Organizations Prior to retirement held several ASE certifications, numerous Factory certifications.
Expert: autohelp Date: 7/15/2008 Subject: 93 cadillac sedan deville electrical
Question QUESTION: Electrical speedometer is on the fritz, as well as the electrical gas gauge. sometimes it says E, or 2 or 5.. just goes crazy. Speedometer sometimes works ok , but mostly goes goofy and then down to zero. Ground wire issue?
ANSWER: ANALOG or DIGITAL speedometer cluster ?.
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QUESTION: Not sure how to answer that.. but the entire dashboard is electric. Not sure what analog means
ANSWER: Analog means does the speedometer have the old style needle to show engine speed or does the speed show in digits ?.
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QUESTION: Oh! It's digital, the entire dash is digital. However I unplugged my battery and and reset everything, and the speedometer seems to be working, but I dont know for how long. Other issues, that might be electrical and associated with the speedometer would be the digital gas guage is wrong sometimes, goes up and down, three of the four power locks dont work.
Answer Check all your BLACK ground wires that are attached to the inner fenders especially near the battery. I would also attach a home made ground from the engine to the firewall. You can purchase a COPPER BRAIDED STRAP for this purpose at any auto parts store. Cadillac has alot of ground problems.
