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Originally Posted by Rhubarb
On the OI you can see our voltage drop from 13v to 5v or less. People running the playing field see the same thing. Bring it back to the pits and the battery has recovered back up to 12+ volts.
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A lead-acid battery reacting like that is normal. As you are loading it down, the voltage drops, but when the load is removed, it will recover significantly. The exact volatges are critical, a tenth of a volt can help diagnosis. For example, 12.6 is charged and 12.4 is half charged...
I'd suspect your trannies - high friction. But, if that hot wire can be verified, that's something that I'd look at closely, because it shouldn't get any more than pleasantly warm, if anything.
Measure the current draw (since you can verify it on the bench) from the battery, if it is about 50 amps average the battery should last at least 5-7 minutes.
Don