Hi from Ken,

"William Pence" wrote in message
...
In article Bephh.212$pr5.108@trnddc01, "west"
wrote:

I have a 40 amp, 13.8v supply and would like to add a voltage (0-15v)
meter
and an amp (0-50amp) meter. Cordially,
west

yep. the amp meter will definitely need a shunt. that value is dependent
on the actual coil current for full scale.

the voltmeter can just wire directly across the output voltage
terminals, but the ammeter will require a shunt.

If the volt meter is not already calibrated it will require a resistor in
series with the positive lead.
Depending on the movement of the meter the resistor could be around say,
49Kohm.

Good luck, Ken, G4KIR.