Shindengen Mosfet FH080 replaced stock R/R - SV650.org

bezsv650 · 07-03-21, 07:33 PM

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.

Seeker · 07-03-21, 08:32 PM

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.

bezsv650 · 07-03-21, 09:29 PM

Quote:

Originally Posted by Seeker

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.

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.

admin · 07-03-21, 10:36 PM

This might help.

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

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GeorgeRYoung · 07-03-21, 10:39 PM

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

bezsv650 · 08-03-21, 03:42 AM

Quote:

Originally Posted by GeorgeRYoung

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

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

bezsv650 · 08-03-21, 03:48 AM

Quote:

Originally Posted by GeorgeRYoung

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

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

Seeker · 08-03-21, 08:51 AM

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.

glang · 08-03-21, 09:15 AM

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?

admin · 08-03-21, 09:54 AM

Quote:

Originally Posted by bezsv650

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

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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07-03-21, 07:33 PM	#1
bezsv650 Member Join Date: Jun 2018 Location: Great Neck, NY Posts: 44	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.

07-03-21, 08:32 PM	#2
Seeker Member Mega Poster Join Date: Jun 2016 Location: NE Lincs Posts: 1,069	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. __________________ 2016 SV650AL7 2023 GSX-8S

07-03-21, 10:36 PM	#4
admin John T Mega Poster Join Date: May 2003 Location: Shrewsbury, Shrops, UK Posts: 2,455	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 __________________ Admin for this forum and the main site. John@sv650.org

07-03-21, 10:39 PM	#5
GeorgeRYoung Member Join Date: Aug 2019 Posts: 48	Re: Shindengen Mosfet FH080 replaced stock R/R The resistance from the (disconnected) stator to ground should be infinite, or thereabouts. __________________ 65 CB160 (67-69), 69 350GTR (69-72), 72 R5, 73 RD350 (73-84), 82 XZ550 Vision (84-03), 01 Concours C10 (03-19), 89 EX250 (11-14), 00 SV650S (14-16), 03 SV650S (19-)

08-03-21, 08:51 AM	#8
Seeker Member Mega Poster Join Date: Jun 2016 Location: NE Lincs Posts: 1,069	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. __________________ 2016 SV650AL7 2023 GSX-8S

08-03-21, 09:15 AM	#9
glang Member Join Date: Oct 2007 Posts: 537	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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