I just installed one of these VRR Mosfet Voltage Regulator Rectifier Suzuki Marauder VZ 800 2005 2006
Mosfet Voltage Regulator Rectifier Suzuki Marauder ...
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It's bigger than the stock Gen1 VRR but fitting to the original top bolt and making a new lower hole allows the fins to rest against the frame cross tube.
It is advertised as MOSFET and the price was good, especially shipped to my friend in the 'States.
It was not stated whether it is shunt or series regulation but thought I couldn't go wrong for the price, even if was a shunt unit. Testing shows that (assuming it really is a MOSFET, it produces a higher charging voltage under load at idle. Checking stator lead current indicates a uniform AC current regardless of load so it is a shunt unit and not series. Too bad but it seems that there are MOSFETs and that they are used for rectification which explains the almost 1 volt higher at idle.
Modification #87 ;-)
Wiring was simple as just extracted the stator spade lug connectors from the original plug and fitted them to the three wire plug body supplied. Plugs into the VRR.
They had shipped a duplicate plug body to the one on the VRR so could not use that to connect to the bike's harness. I didn't mind this much as am not a fan of the minature connector size used for output and ground on the Suzuki wiring. The VRR has two red output wires and two black ground wires. I simply snipped the small connector off the wires and connected a 1/4" eye connector to one black which went to the 6 mm bolt holding the cable clip to the left front of the VRR.
The second black ground wire was fitted with an insulated male spade connector which plugged into the (extracted) black/white ground wire from the VRR plug. This connected to both the common ground harness and chassis. Better.
The two red output (positive) wires from the VRR were connected to one male and one female 1/4" spade lug connectors. These were plugged into the original harness white wire and to the additional heavier white wire which runs to the battery cable side of the starter relay (solenoid).