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· Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
22,617 Posts
So I’m back here again hoping you guys can help me with my trash pile. 1992 Cadillac Seville. I’ve been slowly rebuilding the car and the more I fix it the more it breaks down. My current problem has me chasing my tail. If I drive the car and have my foot on the gas it’s fine. If I let off the gas to slow down or come to a stop, I can watch the battery voltage drop until the car shuts off and totally dies. Usually have to wait about an hour or more and it will start again and then do the same thing. It’s been sitting for awhile since I haven’t had time to mess with it. I jumped it the other day and it ran in park for a solid hour. So it will run in park but if I try to drive the car it looses power. Battery is the second one I’ve put in within a year, alternator was new a year ago, spark plugs, fuel pressure regulator, fuel pump&filter are all new. Distributor rotor is new and the distributor cap and ignition coil are sitting here in a box gong in soon. This isn’t the typical Seville power draw where it looses power from sitting and needs to be recharged. I can start the car every day no problem but if I turn it back off after it’s been running it won’t start again for at least an hour. But if I leave it running in park it runs fine. Please help! I haven’t the slightest clue what’s going on here and I just wanna take my caddy for a Sunday drive again.
it COULD BE several different things -
either the alternator is failing -
OR the battery is defective thus sucking ALL of the power the alternator can supply -

I would disconnect the battery - charge it for at least 24 hours - then have it LOAD TESTED -
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