regulator/rectifier - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 15 (permalink) Old 07-09-2011, 10:55 AM Thread Starter
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regulator/rectifier

went for a ride this morning and got stranded witha dead battery,battery is brand new and just reaired all my sator wires..with bike running I have 13.5V at all 3 stator wires going into the R/R,i have 12.5v coming out but not on the brown wire that one reads a flat 5v...im assuming this means I need a new rectifier/regulator?..if so does anyone know if there is anyplace to get one for less than $100-$120? thanks
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post #2 of 15 (permalink) Old 07-09-2011, 11:18 AM Thread Starter
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ok correction at an idle i get 5V on the brown wire but as i raise the rpm's it climbs to about 12.5v is that normal? thanks
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post #3 of 15 (permalink) Old 07-09-2011, 11:25 AM
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Copied from the Vulcan Verses.

- How to check out the R/R

If you have the Kawasaki Service Manual, you will find R/R checkout on page 15-18. If you don't I will list what is there for you. Quoted from the manual as much as possible: Regulator/Rectifier Inspection Remove the left side cover. Pull out the connector. Be sure to set the hand tester to the 100 ohm range and zero the meter(Not necessary on a digital meter) Check the resistance between the regulator/rectifier terminals as follows(there is a chart and picture in the manual which I cannot reproduce right now but I will try to put it in words for you)

A1 A2 A3 All Alternator Terminals --- --- --- Connector with pins facing you and notch at bottom --- --- ---

G M B G = Ground M = Monitor B = Battery --|__|-- (Hope that came across right)

Measure B to M - should read infinity

Measure B to G - should read infinity

Measure B to A1, A2, A3 - should read infinity

Measure M to B - should read > 10K ohm Measure

M to G - should read > 10K ohm

Measure M to A1, A2, A3 - should read > 10K ohm

Measure G to B - should read between 0.4 to 2K ohm

Measure G to M - should read between 1 to 5K ohm

Measure G to A1, A2, A3 - should read 0.2 to 0.6K ohm(200 to 600 ohm)

Measure A1, A2, A3 to B - should read 0.2 to 0.6K ohm(200 to 600 ohm)

Measure A1, A2, A3 to M - should read infinity

Measure A1, A2, A3 to G - should read infinity

If there is more resistance than the specified value, the unit has an open lead and must be replaced. Much less than this resistance means the unit is shorted, and must be replaced. Hope this helps someone out there. Dan Morgan

1986 Black Kawasaki Vulcan VN750 "Black KAWK"
VN750 #9300 & VROC #33453

EMGO Handlebar, V&H Exhaust, Drop Shocks, Raised/Painted Fork, MeanStreak Seat, Tank Bib, ME880 Oversize Tires, Engine Guard, Custom Mirrors, Chris Products Turn Signals, Ear Shave, 150/42 Jets, PINGEL Fuel Valve, MCCT, Volt Meter, Shendegen R/R, AGM Battery, Coastered, .020 Coils, Relo Gauges & Headlamp, SilverStar Ultra, LED Flashing Brake Light, Center Stand Delete, WOLO Airhorn.
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post #4 of 15 (permalink) Old 07-09-2011, 11:37 AM
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13V from the stator does not sound correct. Was this 13VDC? The votage from the stator would be AC. With the bike warmed up and up on the RPMS from what ive read here you should be getting 50-70 VAC. You need to recheck this if you were testing for DC voltage. If the voltage is incorrect you need to check the continuity of the stator. Reading between each of the stator leads (stator lead -stator lead) I would say you should have 1-3 OHMS. Between each of the stator leads to ground you should have an open (no continuity). If these readings are bad I would say you have a bad stator. If thats the case most on here goes with Tim Parrot for a stator repair (rewind) $85.00. I would replace the R/R as well since it is possible it contributed to the stator failing. Again most people on here says to go with a Mosfet R/R kit $124.00. I just replaced my stator and R/R. Here is a quick check that could be because of a bad stator, does your headlight work when the bike is running?

Last edited by ifixf18s; 07-09-2011 at 11:41 AM.
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post #5 of 15 (permalink) Old 07-09-2011, 12:16 PM
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You should get 13+ at the bat with the rpm at about 14k. Be sure to check all the grounds especiall close to the bat.
I had a problem, I took out the stator connection an soldered the the wires together problem solved.

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post #6 of 15 (permalink) Old 07-09-2011, 12:49 PM Thread Starter
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thanks for the info guys im off to do some testing..i will return witht he results
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post #7 of 15 (permalink) Old 07-09-2011, 02:39 PM Thread Starter
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ok at risk of sounding real dumb..lol do I un plugh the R/R and test the plug going to the regulator?
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post #8 of 15 (permalink) Old 07-09-2011, 03:09 PM
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Quote:
Originally Posted by niterider View Post
You should get 13+ at the bat with the rpm at about 14k. Be sure to check all the grounds especiall close to the bat.
I had a problem, I took out the stator connection an soldered the the wires together problem solved.
14k rpm? I think you mean 4k. Right niterider?

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html

Last edited by OlHossCanada; 07-09-2011 at 03:11 PM.
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post #9 of 15 (permalink) Old 07-09-2011, 03:20 PM Thread Starter
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I have actually removed the R/R and have it right here infront of me..lol It seems that no matter how i test it i dont seem to be getting any readings close to the list
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post #10 of 15 (permalink) Old 07-09-2011, 03:22 PM
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Quote:
Originally Posted by hoggs750 View Post
ok at risk of sounding real dumb..lol do I un plugh the R/R and test the plug going to the regulator?
I think you can.

I would try it first, but if you get low voltage or high resisitance readings on the lead to lead tests I would pull the bullet connectors apart on the yellow stator leads and retest directly at that point. Look for corrosion or burnt wires/insulation at the bullet connectors.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/showthread.php?t=9127
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