My Troubleshooting Procedure can help find the cause of not charging regardless if it has a full fledged 3 terminal Voltage Regulator (BAT ARM FLD) or 4 terminal VR (BAT ARM FLD LOAD) or the older 2 wire Cutout Relay (BAT ARM) that uses a manual Low High light switch charge control......The lights typically are fed off the LOAD (NOT battery/starter) side of the ammeter with a 3 terminal VR or cutout relay but the LOAD terminal if a 4 terminal VR.
Look at my Troubleshooting Procedure and especially the test where you temporarily dead ground the Gennys FLD post to see if it charges then but NOT otherwise which tells you the genny itself is okay...If it charges with gennys FLD grounded (tells you genny is okay) but NOT otherwise the VR is bad or not wired right OR NOT WELL GROUNDED.......... It also tells how to polarize the generator which you should do FIRST BEFORE start up. NO charge with FLD grounded typically means the Genny is bad since the VR function is then by passed.......If it passes BOTH my Motor Tests (see para 5) then genny itself is likely okay so again the VR may be bad or mis wired or not grounded BE SURE VR HAS A GOOD GROUND
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