Bob Fields's Avatar
Join Date: Jul 2010
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Sorry to hear you are having issues.
I don't recall the issue dieselbobcat mentions above affecting the ZX75. Your issue sounds like you might have a bad ground as the unit is not powering up on 12Volt only. I would check all your grounds from the battery, to chassis to behind the radio. On 120V the converter is putting out enough juice to overcome or bypass the issue. Thats where I would start.
Also bikendan is correct, I no longer work with Concertone, but happy to help out where I can. Just remember I am a forum member, not a supplier employee! :-)
Rockwood #8289 WS 2012
F250 6.0 / Husky 16k
With 4 point leveling system