Bad battery. The inverter with no load should not be a heavy current
draw, it should be trivial. But the battery craps out. It's either a
non-battery at this point or, as Karl suggests, you have a damaged
connection at the terminal.

--
RJS

On 07/30/2011 09:16 AM, Daniel Rotblatt wrote:
> When the inverter is connected and no load, the voltage drops immediately down to 8volts - no sagging.  Disconnect the inverter and the voltage at the battery reads 12.x volts again.  I don't think it's a bad battery.  Since I cut off the posts to make it fit, it's mine now anyway.
>
> On Jul 29, 2011, at 3:11 PM, Rocket J Squirrel wrote:
>
>> So here's my guess: If you see normal charging voltage of 13.6 volts on
>> the aux battery with the engine running and the inverter connected, but
>> it sags quickly and heads towards 8 volts once you turn off the engine
>> with the inverter still attached, then the yellowtop is a goner. Can't
>> hold a charge.
>>
>> -- RJS
>
>
>
> Dan
> Los Angeles, CA
> '85 Westy Weekender