This is a good test, too. 

Voltage on house battery with engine on, reefer off. 

Voltage on house battery with engine on, reefer on. 

Sent from camp 

> On Aug 25, 2014, at 8:25 AM, mark drillock <mdrillock@COX.NET> wrote:
> 
> Yep, that is the key question.
> 
> Measure it first with engine running and fridge turned off of 12v mode.
> Then turn on 12v mode on the fridge switch panel and see what happens to
> the voltage.
> 
> If a GoWesty aux battery relay kit is installed then this kind of issue
> seems to be common. Sadly.
> 
> Mark
> 
> 
> 
> 
> Vanagon wrote:
>> What do you see for a voltage on the house battery with the engine running and the reefer turned on and set to the 12vdc mode?
>> 
>>