You have a marine -type boat switch and unless it has corroded contacts or you have other bad connections, the switch isn't the problem. The 4 position switch connects both batteries for more cranking power or dual charging. Switching to auxiliary allows you to run the vehicle or accessories on number 2 battery, and have the main for starting.  
You should check your charging output at the alternator, and at the battery, to see if the switch is the problem.  

Robert
1982 Westfalia
----- Original Message -----
Wrom: VZCMHVIBGDAD
Sent: Thursday, July 11, 2002 12:29 PM
To: vanagon@GERRY.VANAGON.COM
Subject:  

Another quick question to throw out to the group.

My van has a rotary battery switch to control its dual battery setup.  It was installed by a previous owner in the cabinet under the sink.  The switch can select battery 1, battery 2, both or none.  Is this a genuine VW accessory, a Bosch accessory or some other aftermarket accessory???

Anyway, I've been having problems with both of my batteries dying and wondered if it's not the cause.  My question is,  Does the starter always pull from battery 1 (primary battery) regardless of the switch position???  I'm under the impression that all this switch controls is where everything except the starter pulls juice from (accessories and the like).  Does this switch isolate my primary from my auxiliary battery so that the aux. doesn't draw it down when it's low????

Thanks in advance!!!!
Rod Woten
'87 Westy "Wally"
Des Moines, IAGet more from the Web.  FREE MSN Explorer download : http://explorer.msn.com