Mystery Power Outage

Got a bit of a doozy here, I have an 84 lesabre. Everything seems to be working fine up until the other day when I took it onto the highway, it was having a hard time turning over when I got to my destination, it was cranking fine and I had power to my dash and everything but it would not turn over. I managed to get it to start working and I made it home thankfully, when I parked and turned off the car it went completly dead, tried firing it up and I got 0 power. Not even to my lights.

So the next day I cleaned my terminals a little bit, reconnected the wires and got power to everything and it cranked over fine, until the next day, started doing the same thing. So I figured it was my battery, changed my battery out reconnected and I’m still having the issue. This time when I cranked the car, it cranked about 8 or 9 times and then my dash went completely dead again. Reconnected the terminal wires, got breif power, one crank and boom 0 power again.

Anyone got any ideas? I’m thinking maybe the connectors are dirty near the fire wall, correct me if I’m wrong but those can get dirty and corroded right? My brain is thinking it’s the positive terminal wire as well. I’m gonna try to use baking soda, mix it with water to make a paste. Rub it on there.

Would a dirty terminal connector indeed cause this? It gets a small connection sometimes until I crank it over, it’s like it doesn’t have enough juice or something.

Any help would be appreciated thanks guys.

Yes, and on a 40 year old car it could also be bad battery cables.

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That’s what I’m thinking too. These GM side mounted terminals aren’t my favorite hahaha, gonna replace the bolts, see if that fixes my issue. It’s probably just not making good contact.

Thanks.

Take a screwdriver and peel back the rubber cover on the cable to expose the terminals underneath.

If a lot of corrosion is found on the terminals you can try and clean them. But sometimes the corrosion is so bad that it has leached down to where the terminals are crimped onto the cables causing a poor connection. Then cable needs to be replaced.

Tester

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That’s what I was planning on doing, problem is it’s bloody cold out there - 40 C so the rubber is rock hard lol. Gonna try my best, sucks I can’t pull it into the garage. My positive terminal looks exactly like that, it’s tough to clean with the rubber on so I didn’t do a great job the first time. Thanks, appreciate it.

Failed alternators are also a common problem.

Wasn’t the alternator, tested it already. My contact was corroded to shit, just couldn’t see it under the rubber. I butchered taking it off but I cleaned it and electrical taped it afterwards. Good to go, no problems.

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