[Shop-talk] Hooking up a trickle charger to a truck with two batteries and a thermoswitch

[Donald H Locker]

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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