wiring up isolators????

[RootBreaker]

Ok so how does this work?

I have a 90A isolator (before anyone goes there... I am not asking which to buy or get or what to do on that.... as there always seems to be a debate...)


my question is I have a 4 post isolator
NOCO 90Amp Delcotron (CS) Battery Isolator Guard

p/n igd-90-cs

can be found on pg 14 of this...
http://www.wilpowerbattery.com/pdfs/nococatalog.pdf

also the manual here

http://www.noco.biz/InstallGuidesPDFFiles/ig%2090,140,200%20delc%20cs%20inst.pdf

my setup is going to be this...

2x duralast gold 1000ca batteries in parallel under the hood.
they are already there and mounted up...

then 2 x huge frickers in the bed for just the winch....
the isolator will charge the 2 duralasts on 1 circuit for the truck and 2 biggins on the other circuit...

so with that said.. I can see why there are 4 terminals...

1 wire to set of batteries
1 wire to other set of batteries
1 wire from ign on fusepanel
1 wire from alternator (behind alternator that wire???)

my question is that is 4 batteries...
the side of the isolators says...
batteries - 2
alternators - 1

think im pushing any limits with the 4 batteries on this or is that just a default that they put on stuff like this not thinking people are going to use 4 batteries???

the 1000ca batteries are 110 reserve minuts each.. so that is 220 reserve minutes...
the giggies are dumptruck batteries.... 12v... 1300ca each... 395 reserve minutes each!!!!!

 

[RootBreaker]

hmmm i may not be able to use this....

I just looked on the back and it says...
igd-90-cs = Delco (GM) equipped w/Delcotron CS series Alt (most 1985 and newer)

hmmmm...

my father says...

B1 = Battery 1.... easy... run a wire from post to battery
B2 = Battery 2.... easy... run a wire from post to battery
I = Ignition... easy.. run wire from post to ign in fusebox
A = Alternator... i just come off the post off the back of the alternator right????? seems simple..

 

[HarryH3]

The one you need for the old style alternator doesn't have the 4th post for the ignition.

B1 and B2 are just names for the circuits. Each pair of parallel batteries will just look like a single battery to the isolator. It doesn't care how big the batteries are.

 

[RootBreaker]

The one you need for the old style alternator doesn't have the 4th post for the ignition.

B1 and B2 are just names for the circuits. Each pair of parallel batteries will just look like a single battery to the isolator. It doesn't care how big the batteries are.

so your saying dont use the 4th post for ign or is it safe to use it?
will this isolator work?

just hookup the 2 batts and alt wire???

 

[HarryH3]

I'm not sure if it will work with an older alternator or not. I do know that the older style won't work with a newer alternator. You'll need to contact the manufacturer to find out if that one will work in your application or not.

 

[RootBreaker]

got it working. My father was over friday night. Our sons 7th birthday party....

so he looked at it (mechanic of 45+ years) and said.. this is just like the one I just put in the 1990 truck....

He told me to just hook it up... wire from back of Alt to the B1 terminal on the isolator.... back of alt to the A post on isolator and that is it for now. I will hookup the B2 to the batteries in the bed eventually.

you will notice I used a 2gauge ground wire which is temporary as I didnt have any other thick wire for my testing.

im still gonna rewire the entire truck when it gets warmer out due to all kinds of wiring issues I have had...

here is another example... I had a pinched wire when we changed out the motor... so I simply cut the wire at both ends and ran a new wire....