I agree with the other fine gents, bright clean shiny solid frame ground to the regulators metal frame ought to do the job. If things don't check out maybe use a good jumper wire to go direct from the batteries grounded post to the regulators metal frame n see if that makes a difference ?????????
As you already know BOTH the genny and VR/Relay need good grounds. In the event she's charging ONLY if you used a jumper to dead ground the gennys FLD post (tells you the genny itself is okay) BUT NOT OTHERWISE the regulator isn't working or not well grounded or a wire is missing/open. (Or if a cutout relay system the light switch may not be well grounded, see below)
NOTE you mentioned "regulator" yet some of the older and 6 volt systems just used a 2 wire CUTOUT RELAY (NOT a full fledged VR) and the gennys FLD got its ground via a wire up to the Low/High manual charge control light switch. On those systems the Low/High switch may not be well grounded due to rust etc. Do you have a full fledged VR or a Cutout Relay and Low/High manual charge control light switch????????????? Regardless, the relay still needs its good ground to work right and the gennys FLD post needs its ground via the light switch.
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