I have a 98 Bonniville SE, and just recently I started having problems with the car losing complete electrical power suddenly. While the car is running the volt meter will read 14, and then everything will go out... no lights, no dash, nothing.
I've doulble checked grounds, connections to battery, starter and alternator. I also tested the battery and the alternator, both check out good.
I would appreciate any thoughts on what the problem could be.
Thanks.

Did you check both ends of every battery cable?

I've checked the positive lead to the starter, and the lead to the alternator.

Remove the rubber boots from the battery cable ends. Do you find corrosion INSIDE them?

http://www.bonnevilleclub.com/forum/...ic.php?t=67689

This one is from tonight also.

What about the negative side of the battery, it is equally as important.

Let'* say it.

Checking the cables isn't good enough on a bonneville.

You need to remove each cable at each and every end, clean each connection, check under the rubber booties by the battery for more corrosion and only then can you be sure you have done this properly.

Took me about an hour without sweating a drop. Up until I checked under the boots and removed every single connection...I kept having problems.

Bonnevilles want more loving under the hood.. be kind to your bonne..and it'll love you right back.