Voltage variation

randall g writes:


In principle this is not hard to troubleshoot. With the engine running
and a full electrical load, simply measure the voltage starting at the
alternator and moving back to the avionics buss and battery, at all
possible points. At the alternator it should be over 14.0 I think. This
should isolate where there is a voltage drop, and therefore too much
resistance.


The problem is; on a car you have to dodge the radiator fan, but if I'd
ever worked on a plane (not me!!!! That would Be Wrong..) I'd wonder if
that big fan out front did not make life lots harder... and THAT's while
it is sitting still.

But a good test is, after the voltage is stable [ie the starting drain
has been recouped..] is to go from no load to fax load while looking at
the voltage.

What we are asking is: what's the voltage drop between the battery
and the avionics buss? If it is drop in the wiring, looking at no load
will show a voltage ~identical to that at the battery.



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