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07-03-21, 07:33 PM | #1 |
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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.
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07-03-21, 08:32 PM | #2 |
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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.
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07-03-21, 09:29 PM | #3 | |
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Re: Shindengen Mosfet FH080 replaced stock R/R
Quote:
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. |
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07-03-21, 10:36 PM | #4 |
John T
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Re: Shindengen Mosfet FH080 replaced stock R/R
This might help.
https://www.aberdeenbikers.co.uk/mot...gnosis-checks/ Sent from my SM-T510 using Tapatalk
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07-03-21, 10:39 PM | #5 |
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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.
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08-03-21, 03:42 AM | #6 |
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Re: Shindengen Mosfet FH080 replaced stock R/R
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08-03-21, 03:48 AM | #7 |
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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
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08-03-21, 08:51 AM | #8 |
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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.
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08-03-21, 09:15 AM | #9 |
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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?
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08-03-21, 09:54 AM | #10 | |
John T
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Re: Shindengen Mosfet FH080 replaced stock R/R
Quote:
Sent from my SM-T510 using Tapatalk
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