Gave that a go.

Loads on, alternator measured at stud and alt body

14.29

On various places on engine compartment wall

14.23-14.25

I have twinned the wire from alt to battery stud, same gauge as stock. But not touched the starter to battery cable except for cleaning terminals 

Alistair 

> On Apr 9, 2020, at 1:57 PM, vw_van_fan_Mark <madvws@cox.net> wrote:
> 
> Next time you see that much drop under load, try measuring between the
> alternator case and clean bare metal on the van body to see how much may
> be due to the ground path for the alternator.
> 
> Mark
> 
> David Beierl wrote:
>>> 
>>> Alternator 14.39
>>>> Battery 13.91
>>> 
>>> 
>> That's more drop than you want to see in the cable.
>> 
>> Yrs,
>> d
>>