2016 ProXs Voltage issue

[HOOK123]

I have been chasing an issue for a year.
having battery issues I am using a Group 31 X2. Started having having to jump even after a couple hours of live well use, live scope is on its own battery. So I changed the pumps out. Didn’t help, put a amp
meter on it less than 3 amps running.

So today I figured out it’s an issue getting power to the motor. Seeing a full volt drop from battery to what smart craft reads. Any ideas where to start looking

[Redngoo]

Bad diode in the alternator?

[HOOK123]

That voltage drop is without the motor running, I had the charging system checked they said it was fine. I see 13.8 on smart craft when running

[Lightning 6]

No expert ….. but recommend you start checking at the source. Battery connections (clean, engine cables on first, nylock nuts), connection at starter (clean & tight), cutoff switch (clean & tight…..remove from panel & check voltage across lugs…..switches can fail ….. even quality switches).

[BrotherJim]

I just replaced an X2 after 6 months battery bad
may want to get it tested

[JOE54]

No expert ….. but recommend you start checking at the source. Battery connections (clean, engine cables on first, nylock nuts), connection at starter (clean & tight), cutoff switch (clean & tight…..remove from panel & check voltage across lugs…..switches can fail ….. even quality switches).

^^^^^^+1