In a message dated 6/14/00 9:45:42 AM, wdavidson@thegrid.net writes:

<< > The Hella dual battery kit comes with a relay (with an unknown amperage
handling
> capability), some wires of various colors, and a wiring diagram.

I don't think I would be wanting to install a relay with unknown amperage
rating in this situation. (I used a 70 amp relay in my installation). >>

Yes, you should be using a relay with at least a 50 amp rating, or more
depending on your battery type.

Also be careful where you draw your relay switch voltage from.

When troubleshooting my '74 Westy's second battery system, I discovered that
there was no voltage present at the relay switch until the engine was
running.

The relay switch was activated by a wire from the voltage regulator.  If you
have a discharged high amperage battery and connect the relay to a power
source off of your ignition, then your second battery could easily draw
enough current to keep you from being able to start your vehicle.

Steve Lashley
'66 Westy
'74 Campmobile
'93 EV MV
http://EuroCampers.com
314-614-0750
Importing German Side Tents, Carver Propane Heaters and other Accessories for
Bus, Vanagon and EuroVan