Finished my TPE stator and MOSFET R/R upgrade - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 20 (permalink) Old 08-08-2013, 07:23 PM Thread Starter
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Finished my TPE stator and MOSFET R/R upgrade

Hello All,
I just had a quick question to follow up on my recent modification. When I fire up the bike I'm getting 14.3 volts at startup and after the bike gets to temperature. The reading is consistent whether at idle or around 3k rpms. I had topped off my battery when I first parked it with my maintainer and the battery voltage reads 12.5 with the bike off. I have the new R/R wired directly to the battery and while I'm very excited to see this output. I'm worried about overcharging my battery.
Any thoughts?
Thanks in advance, Yuma.

1994 VN750
Purchased March 2011 with 14,800 miles
Memphis Shades wind screen, saddle bags
Pulled the exhaust baffles
Marbled
Relocated the R/R
Manual ACCT's
AGM battery
Iridium plugs
NGK wires
TPE stator
Tuxedo mod
Shindigen MOSFET R/R
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post #2 of 20 (permalink) Old 08-08-2013, 07:38 PM
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umm, i thought that was the whole reason to put the MOFSET on.. it keeps the voltage at the needed 14.5 volts through all rpm ranges. The voltage is needed higher at idle more than any other time, because the cooling fan generally comes on when you are sitting at traffic lights
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post #3 of 20 (permalink) Old 08-08-2013, 07:53 PM
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Quote:
Originally Posted by 7502Yuma View Post
Hello All,
I just had a quick question to follow up on my recent modification. When I fire up the bike I'm getting 14.3 volts at startup and after the bike gets to temperature. The reading is consistent whether at idle or around 3k rpms. I had topped off my battery when I first parked it with my maintainer and the battery voltage reads 12.5 with the bike off. I have the new R/R wired directly to the battery and while I'm very excited to see this output. I'm worried about overcharging my battery.
Any thoughts?
Thanks in advance, Yuma.
My setup (in my signature) functions exactly the same way. You are good to go. If you had an AGM type battery, that would be even better since evaporated electrolyte is recycled back into the glass mat, they apparently cannot be boiled dry as a wet cell can. AGM = Absorbed Glass Mat

edit: I can see your signature now. It wasn't visible while posting.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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post #4 of 20 (permalink) Old 08-08-2013, 07:59 PM
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i would say you are golden with those numbers i wish mine did that good lol

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post #5 of 20 (permalink) Old 08-09-2013, 12:08 AM
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You're good. 14.3v is a safe charging voltage for a 12v battery. the results you are seeing after your upgrade are normal and typical.

......I'd rather wake up in the middle of nowhere then in any city on earth.

*2014 VN900 Custom (16,200 miles and counting)
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post #6 of 20 (permalink) Old 08-09-2013, 10:06 AM
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You're good. 14.3v is a safe charging voltage for a 12v battery.
Yup. However a vn will overcharge. The manual states as high as 15v. I now understand why, but it bothered me back when I discovered this fact.

Would be hard on the conventional OEM batteries.
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post #7 of 20 (permalink) Old 08-10-2013, 09:31 PM
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Since installing this voltmeter:

https://www.vn750.com/forum/showthread.php?t=37922

I've noticed the charge rate is 14.5v at first, but after 10-15 miles or so, the charge rate tapers down to around 13v, changing when the fan runs in slow traffic or at stoplights and then occasionally going up to about 14v for short periods at cruise. It doesn't stay at 14.5v the entire time it's running. I would say it spends more time at 13v on a long ride.

That's the regulator doing it's job.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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post #8 of 20 (permalink) Old 08-10-2013, 11:23 PM
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Quote:
Originally Posted by Spockster View Post
I've noticed the charge rate is 14.5v at first, but after 10-15 miles or so, the charge rate tapers down to around 13v, changing when the fan runs in slow traffic or at stoplights and then occasionally going up to about 14v for short periods at cruise. It doesn't stay at 14.5v the entire time it's running. I would say it spends more time at 13v on a long ride.

That's the regulator doing it's job.
Yup, if it did not reduce, you would overcharge the battery. Your figures are measured at the battery. The R/R could be 'seeing' 15v. It is designed to shunt higher voltage/lower amperage to ground. A lot less heat.
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post #9 of 20 (permalink) Old 08-12-2013, 10:41 AM Thread Starter
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Thanks to all for the input. Looks like I'm good to go. I really like the numbers just didn't want to risk blowing anything.

1994 VN750
Purchased March 2011 with 14,800 miles
Memphis Shades wind screen, saddle bags
Pulled the exhaust baffles
Marbled
Relocated the R/R
Manual ACCT's
AGM battery
Iridium plugs
NGK wires
TPE stator
Tuxedo mod
Shindigen MOSFET R/R
7502Yuma is offline  
post #10 of 20 (permalink) Old 08-12-2013, 11:27 AM Thread Starter
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Thanks I'll have to add a volt meter on next . Is it still working well?

1994 VN750
Purchased March 2011 with 14,800 miles
Memphis Shades wind screen, saddle bags
Pulled the exhaust baffles
Marbled
Relocated the R/R
Manual ACCT's
AGM battery
Iridium plugs
NGK wires
TPE stator
Tuxedo mod
Shindigen MOSFET R/R
7502Yuma is offline  
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