If it's a regular 12V battery trickle charger, hook the +lead to one
battery's +terminal and the -lead to the same battery's -terminal. The
other battery won't know it's there.
If both batteries are going down regularly, you'll have to connect
similarly to the other battery to trickle-charge it and swap back and
forth, say twelve hours each.
Or get another trickle charger for the second battery or a 24V version
that you can hook across both simultaneously.
I don't know off-hand of a thermo switch; I just plug my block heater in
and have a timer on it so it gets a few hours of heat before the morning
start. I only plug the heater in when I know the night temperature will
be low enough to warrant the heat.
Donald.
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On 2019-03-03 10:10 a.m., eric--- via Shop-talk wrote:
> Two Quick questions,
>
> 1- Can I hook up a normal trickle charger to a truck that has two
> batteries? If so, how should I wire it? I'm finding confusing info on
> the web.
> Do I hook it up to one battery only?
> Do I put the pos on one batt and the neg on the other?
> Do I need one for each battery?
>
> 2- Is there a 120vac themo switch for a trucks block heater? (so it
> only turns on the block heater if the outside temp is below a certain
> temp? (what would that temp ideally be?)
>
> Thanks again all!
>
> Thanks in advance.
>
>
> Sent from my Commodore 64 on a 2400 Baud Modem.
> Tech Viper
> "Be as beneficent as the sun or the sea, but if your rights as a
> rational being are trenched on, die on the first inch of your
> territory." Ralph Waldo Emerson
> -Who is John Galt?
>
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