2 battery wiring question
 

I have just ordered a isolator off of ebay that should look something like this when installed, specific to wiring:

Attachment 27047

An this is what I believe I want to do, to be able to have both batteries on demand from a switch in the cab:

Attachment 27048

So both of these wiring schemes would exist together. Does this look correct??

Maybe it's just because I'm on my phone but the pictures look blurry. Basically for a dual battery 12V system you just hook them in parallel (+ to +, - to -). I don't understand the purpose of the switch in the cab. What are you wanting to isolate it for?

Just double checked the pics in multiple browsers and they are clear, prob your phone.....

Parallel batteries can drain from each other, can cause damage to each other and would need to be almost exactly the same battery.

You don't retain the ability to have a back up battery if one goes dead without the relay, if you have other systems hooked up to your AUX battery without idle.

How are you going to keep the backup battery fully charged?

That what the isolator circuit does...it's the only thing it does:

Attachment 27056

Sure Power Industries Multi Battery Isolator
Pole #1 To + on alternator
Pole #2 To main batt
Pole #3 To AUX batt

I just want to make sure I'm not missing anything on the overlay of the relay circuit. I think it's right but, that's what these sites are great for...people smarter than I am...

.....speaking of which, if anyone could tell me how to put big pictures on these posts it would be appreciated! :)

I've never had dual batteries except on an RV and those were two 6V in series. Let us know how it works out...

Oh also... the relay [In the second pic] will be the appropriate AMP not the 30A pictured..was just using the pics for visual reference

I posted on here and LRO so hopefully I will get some more feedback. Thanks june82000!

I posted this on Land Rovers Only

Was it one of these?

If so, you'll probably kill your batteries pretty quickly. Your typical diode type isolator creates excessive volt drop so that your batteries won't be getting the charging voltage they need. With an adjustable regulator type alternator you can up the charging voltage to compensate. As far as I know the Disco regulator can't be adjusted.

If you want a diode type you need a schottky diode isolator.

Holy moly! I actually accidentally bought the correct one! :) I thought about messaging you but, I have been annoying the master enough lately..:)

This picture is bigger and you can see the Schottky thing on the side...

Attachment 27058


P.S. My Rotella came in today...last 2 gallons on Amazon Prime for $12.77 each!

Rotella 550019913 T Triple Protection CJ-4 15W-40 Motor Oil - 1 Gallon
Sold by: Amazon.com LLC
$12.77


Uh... so does the wiring look right?