Voltage variation

writes:


I should add: Many batteries get replaced because the engine
doesn't crank very well. You need to take voltage drop measurements
across the master and starter solenoids while cranking; you'll often
find that their contacts are burned and introducing resistance with
the large current flow. Resistance checks mean nothing on these
things; even a quarter ohm will cost a bunch of voltage, and with
large current flows heat is generated, which increases the resistance
further. Same goes for cable and terminal crimps and connections.

Yes. I measure, for example:

a) On the battery term.
b) On the lug
c) On the wire in the lug.(That's why you have a sharp pointy probe.)
....

The hassle is, you have to do this under load, which usually means
"cranking" which means various dangerous parts are moving...


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