Bob M or Bob or Jim n others can correct my errors, but heres my take on what you have n see.....
EASY ONE FIRST The one "coil/relay" is a Cutout Relay which closes (between BAT and GEN/ARM terminals) when the gennys ARM output voltage is higher then the battery but opens otherwise so the battery cant reverse discharge thru the genny when shes shut down. Its has both a Shunt and a Series winding.
The other "coil/relay" is likely a current control regulator which increases or decreases the gennys Field current as necessary to charge but NOT overcharge the battery (if adjusted n working correct that is???). It does so by switching and/or via pulse width modulation (chattering) to add or remove extra resistance into the field to ground circuit thereby increasing or decreasing the gennys output.
Some 2 coil VR's (what you have) use a combination Voltage n Current control relay while others (my guess what you have) use just current ORRRRRR voltage control. The 3 coil relays have a Cutout Relay, a Voltage Controller, and a Current Controller. Im guessing you have a current control relay becauseeeeeeeeeeee if it was a voltage control relay it needs adjusted to work at 8 volts buttttttttttt I take it yours hasnt been adjusted right???
As I understand it, On the 2 wire cutout relay systems you can charge an 8 volt battery with no modifications..........If you have a 2 coil relay that has a current controller, again it can charge at 8 volts no mods,,,,,,,,HOWEVER if you have a VR that uses a Voltage Controller relay, it needs adjusting to charge an 8 volt battery otherwise you may not charge it correct n maybe RUIN the battery.........
If a battery is overcharged it will outgas excessive and/or boil over n self destruct, maybe you need a VR adjustment so depending on what type VR you have, you may be able to PROPERLY charge that 8 volt battery
Until corrected thats my story n Ima stickin to it lol
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