A bad battery has a higher internal source impedance, so it behaves like there is a resistor in series with it.
Battery or starter...
- Thread starter marc11
- Start date
That's what higher IR means.
IR will increase over the life of the battery, for lead acid, maybe starts around 10 mOhm and not that good anymore once it gets over 25.
The point is that the lower V is IR related, and not linked to any kind of miraculous CA boost that might fry the starter.
The level of discussion was pretty amazing and educational, thanks.
Just to wrap this topic up, the battery failed the load test and cranking tests, and had a capacity of 80% so a new battery has been ordered.
Thanks to all for the help and suggestions. Oh and I did check the starter relay for corrosion and cleaned the start and engine kill switches with contact cleaner for good measure.
Just to wrap this topic up, the battery failed the load test and cranking tests, and had a capacity of 80% so a new battery has been ordered.
Thanks to all for the help and suggestions. Oh and I did check the starter relay for corrosion and cleaned the start and engine kill switches with contact cleaner for good measure.