What is draining my battery?

Tiny
LARRY KELTY
  • MEMBER
  • 1998 OLDSMOBILE BRAVADA
  • V8
  • 4WD
  • AUTOMATIC
  • 177,000 MILES
The vehicle battery is at full charge. As soon as I hook up the positive cable it goes from 12.7 volts down to 4.5 volts, I take the positive cable back off and the battery voltage starts going back up. The vehicle will only try to start if I have my battery charger on it and switch it to 200 cranking amps and spraying starter fluid however the vehicle never does start, I believe the entire system is being drained and will not allow it to receive any spark whatsoever without the battery charger it will not even turn over. However, it is not blowing any fuses or relays it I can tell and there's no smoking wires or anything like that I can't tell what this could be. Thank you I appreciate any help I can get.
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Monday, September 26th, 2022 AT 9:50 PM

3 Replies

Tiny
KEN L
  • ADMIN
Yep, it sounds like the battery is no good, I would get a new one and install it. Here is a generic guide that can help with instructions in the diagrams below to help with your car:

https://www.2carpros.com/articles/how-to-replace-a-car-battery

Check out the images (below). Please let us know if you need anything else to get the problem fixed.
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Tuesday, September 27th, 2022 AT 10:44 AM
Tiny
LARRY KELTY
  • MEMBER
I have replaced the battery with a new one. The same thing happens unhooked alternator hooked positive cable back up battery goes drains immediately with or without key on and will not turn over. I will only have ignition and dash light and it will only turn over if I have 200 cranking amp battery charger hooked up but still will not start.
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Tuesday, September 27th, 2022 AT 6:15 PM
Tiny
KEN L
  • ADMIN
Is there a large spark when you connect the battery? Can you upload a short video of the battery connection? If there is not a large spark, then the battery has gone bad/defective. Can you turn the headlights on and are they bright when you crank the engine over?
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Thursday, September 29th, 2022 AT 12:56 PM

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