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scratcher 29-04-2015 02:56

alternator sence wire
 
many years ago I fitted a diode inline with what I remember as the voltage sence wire to trick the alternator into upping the voltage to the batteries.It was on a volvo 18 hp 2 cylinder.The .6 v drop accross the diode increased the output from approx 13.9 to 14.4 as I remember and did shake some life out some oldish batteries.Any alternator experts want to chime in as I want to repeat this

atoll 29-04-2015 04:21

Re: alternator sence wire
 
not sure if a diode would do anything,i think you mean a resistor

btrayfors 29-04-2015 04:33

Re: alternator sence wire
 
Quote:

Originally Posted by scratcher (Post 1812876)
many years ago I fitted a diode inline with what I remember as the voltage sence wire to trick the alternator into upping the voltage to the batteries.It was on a volvo 18 hp 2 cylinder.The .6 v drop accross the diode increased the output from approx 13.9 to 14.4 as I remember and did shake some life out some oldish batteries.Any alternator experts want to chime in as I want to repeat this

That should work fine, but check the alternators output closely.

Note that 13.9VDC is too low for effective battery charging. And, 14.4VDC is also too low for most flooded lead-acid batteries (Trojan recommends 14.8VDC to 15.0VDC for their T-105s).

Bill

SteveSails 29-04-2015 05:42

Re: alternator sence wire
 
In theory it will work but a silicon diode needs a few milliamps (.001Amp) of current through it to drop .6 - .7V. The voltage sense circuit in the regulator may not draw that much and you may only see half that drop. But you may not need the diode, external regulators like the Balmars are programmable and you should be able to set the charge voltage without any extra 'tricks'.

Stu Jackson 08-05-2015 12:43

Re: alternator sence wire
 
Why not just run the sense wire to where it should be: the house bank.


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