Lk-350 faulty?

[Weyland1982]

Hi!
I've recently purchased an LK-350 and im having some issues with the unit.

For alle intents and purposes, the unit seems to work...

However im unable to adjust the voltage cut off... (it's apparently set to 12.0 v by default, cutting it a little to close for comfort imod)

Pressing mode, or any button, seems to do nothing.

I've set it up like this :
b+ (always on) in fusebox using AddAFuse.

acc (ignition on) on cigarette lighter wire.
grounded on cigarette lighter ground wire

-all tested using voltmeter.

Im also not able to read current voltage by pressing "mode"?

Any advice?

Thanks in avance.