Shindengen Mosfet FH080 replaced stock R/R
 

My stock R/R was wreaking havoc on my batteries and my Ignition control unit. I replaced with a genuine Mosfet R/R in accordance with the guidance on this site. Diode test on new R/R is good, I checked the stator resistance and voltage values are good. The voltage across the battery is 12.4 Volts Idle BUT doesn't increase with revs. Please help me.

Re: Shindengen Mosfet FH080 replaced stock R/R
 

The first thing I'd be interested in is the output from the stator. Disconnect it from the reg/rec. There are 3 wires coming out of the stator (often yellow), call them 1,2 and 3 - measure the AC voltage at idle and at, say 5k rpm - measure 1-2, 2-3 and 3-1. At 5k rpm I'd expect to see > 60Vac - this is an estimate but it should be a high value and similar on all 3 measurements.

Re: Shindengen Mosfet FH080 replaced stock R/R
 

Yes, for all connections I'm getting around 30v idle and 60v at 5K rpm consistent numbers for each combination. Resistance = 0.4 Ohms across each connection also.

Re: Shindengen Mosfet FH080 replaced stock R/R
 

This might help.

https://www.aberdeenbikers.co.uk/mot...gnosis-checks/

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Re: Shindengen Mosfet FH080 replaced stock R/R
 

The resistance from the (disconnected) stator to ground should be infinite, or thereabouts.

Re: Shindengen Mosfet FH080 replaced stock R/R
 

I'm getting OL for resistance from stator terminals to ground. Getting 0.1 ohms for -ve regulator connector to ground.

Re: Shindengen Mosfet FH080 replaced stock R/R
 

Thanks, that's a very useful guide. I think everything is checking out. your article suggests I need to check the grounding from R/R . Not sure how best to test that I'm getting a resistance reading of 0.1 ohms from -ve terminal of R/R to -ve terminal of battery

Re: Shindengen Mosfet FH080 replaced stock R/R
 

another thing to check is the condition of the wiring between the stator and the reg/rec, paying particular attention to plugs/sockets. Look for corrosion and signs of burning. Some people bypass the bike's loom and connect the stator directly to the reg/rec using 12 or 14 gauge wire, then connect the reg/rec directly to the battery via a suitable 30A fuse.

Re: Shindengen Mosfet FH080 replaced stock R/R
 

so does it look like no charge is getting to the battery? What happens to its voltage reading while running when you put more load on it such as main beam?

Re: Shindengen Mosfet FH080 replaced stock R/R
 

The bolts holding the reg to the frame should ground it so do a resistance test from those bolt to somewhere else on the frame (engine bolt?).

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