Okay, your language sounds like you have a full fledged Voltage Regulator (3 or 4 terminals, BAT GEN/ARM FLD LOAD if its a 4) instead of a simple Cutout Relay (usually 2 sometimes 3 terminals, BAT and GEN/ARM).
Heres the deal, ifffffffffff its just a simple Cutout Relay, a 6 volt genny can charge an 8 volt battery, although not at any high charge rate. HOWEVER if its a Voltage Regulator which utilizes a voltage control relay, its not gonna charge an 8 volt battery well (if at all) until its adjusted and thats tricky to describe over the net, Jim N has helped with that before I believe.
OKAY, if its a 4 terminal VR many of those have the ARM/GEN terminal underneath or off on one side by itself while BAT FLD LOAD are together, SURE ITS WIRED RIGHT????????????
OKAY, Regardles if a VR or relay, IT (the relay or VR plus genny itself of course) MUST HAVE A GOOD GROUND TO WORK, be sure its case is well grounded, try a jumper wire maybe to check it out.
OKAY, regardless what it has, when shes running try to momentarily dead ground the gennys FLD post n see if she charges then???? If so but not otherwise, the genny itself is okay so theres a problem in the VR (or its needs adjusted) orrrrrrrrrr the VR isnt well grounded,,,,,,,,,or the wires bad from FLD on Genny to FLD on VR or up to the light switch (if its a cutout relay system) ,,,,,,,,,,or the light switch is bad or not well grounded (again if its a cutout system)
If its a VR and you use an 8 volt battery it may work if adjusted but if a cutout relay it can work (maybe not high amp rate) with nothing done ifffffffff all else is okay
Insure correct wiring (if its a VR),,,,,,,,insure VR or relay has a good ground,,,,,,,,try to dead ground the gennys FLD post when shes running at high RPM and if she then charges the genny is okay so a VR must need adjusted or isnt well grounded or if its a relay system the LHBD switch is bad or not well grounded or teh wire from FLD on genny up to switch is bad.
Does the genny pass BOTH my Motor tests??? maybe the genny is just bad????
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