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Compass Marine How To | all galleries >> Welcome To >> Alternators & Voltage Sensing - Why It's Important > Regulator Volt-Sense To Battery = Correct
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Regulator Volt-Sense To Battery = Correct

Finally we now have correct voltage sense wiring. As can be seen the regulator is now driving the alternator to 15.01V in order to have 14.4V at the battery end. The voltage sensing circuit on Balmar and the Xantrex XAR regulators is a CIRCUIT. This means the red wire and the regulator negative wire both need to see battery terminal voltage for optimal performance.

NOTE: In the spirit of simplicity of the illustration these drawings lack an alternator output fuse. This fuse would be within 7" of the battery banks positive terminal. They also lack a positive volt sense wire fuse, also within 7" of the battery banks positive terminal...

Get all the speed & charge performance you've paid for by wiring your alternator positive & negative output direct to the house bank. After you've done that wire the volt sensing circuit direct to the positive and negative bank terminals as well. Like anything it's all in the little details..

other sizes: small medium original auto
David Popken 28-Oct-2015 01:58
So, do I need to adjust the upper voltage limit to exceed the factory setting of 14.2 in order to allow it to charge at 15+?

Also, I have dual output Balmar, Model 9115, and the original alternator is also still attached and belted to the engine(W38B). I have just begun the wire tracing, but I assume the original still outputs to something, and the Balmar may be combined. Thoughts?