Cigarette Plug Voltmeter

[Rideitout]

Cigarette plug voltmeter - very handy for knowing the battery status while sitting on the water with the radio going:

http://www.amazon.com/gp/aw/d/B0092...+plug+volt&dpPl=1&dpID=51EPoTaX+vL&ref=plSrch

 

[jetboater4life]

I bought a few of those and one crapped out right away.

 

[Ronnie]

I have one that I've never used.

In a stock dual battery setting what battery is it reading? I assume it is the house battery not the starting battery.

I have the same question about the voltmeter on the multi function gauges of my boat but there I assume Yamaha set voltmeter to reflect the starting battery.