Dual Alternator wiring 07 Tahoe

[MalcDogg]

So I purchased the dual alternator bracket and second alternator 4 pin got everything installed but the second alternator is on putting out 11-12 volts and it’s not keeping my second battery charged

Can someone help me out?

 

[exp500]

More info needed> Like Exactly how it is wired. How is the computer controlling 2nd alt? There are several threads here with multiple hi amp alts for reference.

 

[MalcDogg]

More info needed> Like Exactly how it is wired. How is the computer controlling 2nd alt? There are several threads here with multiple hi amp alts for reference.

2nd alternator has a 4 pin
Only 2 wires from the 4 pin one wire with resistor is connected to ignition on
The other wire is connected to battery post on alternator and battery is connected there as while

 

[exp500]

Wired wrong

 

[MalcDogg]

How should it be wired?

 

[MalcDogg]

Wired wrong

How should it be wired

 

[exp500]

Computer controlled OEM Alt in 1st position, 2nd position you have alt idling with no control. You didn't provide what you did for install of 2nd battery, No specs on Truck or alts. Standalone? Parallel? Called charging system for a reason.
I think you bought the wrong alt for your "upgrade", so it has the wrong voltage regulator for way you have it wired.

 

[MalcDogg]

Computer controlled OEM Alt in 1st position, 2nd position you have alt idling with no control. You didn't provide what you did for install of 2nd battery, No specs on Truck or alts. Standalone? Parallel? Called charging system for a reason.
I think you bought the wrong alt for your "upgrade", so it has the wrong voltage regulator for way you have it wired.

The 2nd alternator (253amp) came with the bracket and 4 pin connector but no instructions on how to wire it the connector only has 2 wires one as a resistor on it I’m pretty sure that wire goes to ignition power when key is on

I have a 2nd battery that stands alone for the second alternator

it’s a stand alone setup

 

[exp500]

Post full specs for truck including part numbers for truck alt and#2 alt. 4 pin flat? 4 pin oval? Which 2 pins? or I'm done.

 

[MalcDogg]

Post full specs for truck including part numbers for truck alt and#2 alt. 4 pin flat? 4 pin oval? Which 2 pins? or I'm done.

Oval shape 4pin