Hi I put the one from the bus depot in mine. Hooked it to the kitchenette I installed instead of a battery. Here it goes:
Red wire hook to main battey
Brown wire is ground, screw into something metal
Black wire goes to the front, pull out the fuse panel, if you have heat under the rear seat then it should be easy, find the X-contact/ load reduction relay, find the wire that has power running to that, splice and wire the black wire to that wire
Blue/Red is the power to whatever you want to power, hook it to what you are powering
hope this helps,
Tracy
85' GL "Ripple"
 James V <tornadored@EARTHLINK.NET> wrote:Well, I apologize to all for bringing this up... but I've been pouring over
the archives for the last 2 days with out luck. Lots of info on Westy
installs w/ the built-in relay, but couldn't find much for non-westys.

So, I'd like to add a 2nd battery to my 90 Carat to power some very small
items while camping (light, cooler, maybe a laptop...) as well as have a
backup starter battery.

I plan to use a relay system (I know there are other methods, but I'd rather
not go off on that tangent) and would like some direction, instructions,
and/or diagram for the installation. I'm considering the Bus Depot Hella
Kit, but am also open to making my own...if I knew how to wire it up. I
know the kit includes instructions, but it sounds as if they aren't much
good to an amateur (me). Maybe someone who did use the kit (non-westy)
could fill in the blanks?

The battery will be under the driver seat. I'm still assessing my specific
needs regarding the battery, so I'm not too concerned about that at the
moment (maybe next week)...just wanna know how to hook it all up.

Any and all info/advice/links/pics/etc on the subject would be MUCH
appreciated. Thanks!

James
90 Carat