In article ,
Harry Bloomfield wrote:
on 10/05/2018, Bill Wright supposed :
I helped a friend (a friend in need...) who had a similar problem in a
motorhome. For some bizarre reason the starter battery was in a
locker instead of in the engine compartment. It wasn't all that far
but during a start the voltage at the starter motor was about 6V. In
the end we put the battery back where it should have been and that
fixed it.

Many people do not understand volts drop and just how serious a problem
it can be at such low voltages. They base their calculations simply on
the current rating of the cable and even the pros ignore volts drop..

I keep trying to persuade members of my old car club to measure voltage
drop directly - ie across either ends of the cable. Which may mean
extending one of the test leads. Which then isolates just where the drop
is occurring - 'live' or ground.
And that open circuit measurements are pretty useless - you need to
measure under load. But am whistling into the wind. ;-)

--
*Frustration is trying to find your glasses without your glasses.

Dave Plowman London SW
To e-mail, change noise into sound.