Posted by John T on September 22, 2009 at 09:27:21 from (66.244.97.31):
In Reply to: Generator on M posted by Bill in IL on September 22, 2009 at 07:22:15:
Bill, the purpose of that 3 brush genny is so you can regulate the gennys max output current. They were used more on the older Cutout Relay systems versus the full fledged Voltage Regulators.
The closer the third adjustable brush is to the fixed brush right next to it THE MORE THE CHARGE. The other fixed brush is the fixed grounded brush which is like 180 opposite across from the other fixed Armature brush (ie one next to third adjustable). Some Delco gennys say no closer then 1.5 commutator bars while others say 2.5 etc
HOWEVER when the full fledged VR is used theres less worry of overcharging and I usually advise people to set the third brush to max charge since the VR still protects the genny moreso then only a Low/High light switch did.
(L)oad Terminal: On the 4 terminal VR loads like lights and ignition are best fed from the VR's L terminal versus the Load side of the ammeter (like on 3 terminal VR systems). That way less current has to flow through the VR's internal Cutout Relay and they are said to do a more precise job of preventing overcharging. While it will stil work if lights are fed from the ammeters load side (which wires down to VR BAT terminal) and the L terminal is ignored, I ADVISE YOU USE THE L TERMINAL
NOWWWWWWWW see what she does if you dead ground the Gennys FLD post?????????? If she charges okay then but NOT otherwise, the problem may be the VR ORRRRRRRRRRRRR VR needs adjusted ORRRRRRRRRRRRR the VR isnt well grounded
NOTE If the L terminal is used and its a good battery the system may be working fine AS IS. Once the batetry is charged up its NOT supposed to keep pumping more high amps into the battery, and consider the gennys current used to run lights and ignition is now going DIRECT TO THEM AND ITS OUT OF THE CUTOUT REALY CIRCUIT.......
If you just gotta have more amps (Im not sure that you really do) I would adjust the third brush closer to the fixed one beside it and insure the VR has a good ground.....
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