My 94 LeSabre has problems...

[A94BuickLeSabreOwner]

When we get it up to highway speed for about 30mins and then turn the headlights on, it dies. The right side window doesn't always work. We think it's a short but I'm not too sure.

 

[HotZ28]

If you have a good/new battery and the alternator is working as designed, more than likely, the side post battery terminals need to be disassembled, cleaned & tightened.

 

[A94BuickLeSabreOwner]

HotZ28, I have replaced the battery and alternator a while ago and it still dies. When I get some time I will try what you said. Thank you.