Lan,
Connect the new converter to just the trailer battery. Actually, there
is usually a "Power" wire coming from the tow vehicle to charge the
trailer battery while on the road. To use it, you need an isolator,
either diode-style or a relay to prevent running down the vehicle's
battery by using too many lights in the trailer while the tow vehicle is
plugged in. That "Power" wire (and associated ground wire) is too light
to do much charging, I've measured it at only 4 or 5 amps.
<<Jim>>
[EMAIL PROTECTED] wrote:
>
> This is probably in that large category of dumb questions, but I'm replacing
> the 40 amp Univolt on my '70 Overlander with a Newpark 40 amp. Aside from
> having fewer fuses and circuits, if that's the right word, the new box also
> has connections for only one battery, the one from the trailer. The original
> Univolt has two, one for the trailer battery and one for the auto battery.
>
> My question: What is the purpose of having a connection from the car
> battery? I guess if the auto battery is run down, you could charge it, but
> since electricity runs both ways wouldn't it pull power from the trailer
> battery when you crank the engine? So, in connecting to the new voltage
> converter should I try to jury rig a connection to both batteries, or just to
> the trailer battery?
>
> --Lan Sluder
>
>-
--
<<http://www.oldengine.org/members/jdunmyer>>
<<[EMAIL PROTECTED]>>
<<lower SE Michigan, USA>>
<<mailto:[EMAIL PROTECTED]>>
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