Re: Wiring Harness for a 1951 Packard 200 Deluxe

Posted by Thomas Wilcox On 2011/1/5 16:30:57

Regarding the jump: just because the battery shows 6.4 volts when no current is being drawn does not mean the battery has the oomph to turn over the motor. Essentially, the batteries electrons are energetic enough to register 6.4 volts at rest, but there are just not enough of them to provide the necessary amps once the current starts to flow.

Charging an old, sulfated battery will not solve this problem.

You can test this by looking at how much the battery voltage drops when you try to run the starter. If it drops below about 4 (I think), your battery is probably toast.

Tom