Question about 1979 Yamaha XS 650 F

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79 XS660SF Voltage Regulator

I have a 79 XS650SF, I bought a new voltage reg.
The problem is, the old one is a points type and the new one is
solid state. Can I use it?

jimshorts1984@hotmail.com

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Solid state is far more efficient than your original regulater do yourself a favour fit it up & enjoy the ride

Posted on Apr 24, 2010

Testimonial: "Thank youfor the info. It was a great help, You were right. Jim"

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79 3/4 ton 4x4 voltage dropping lights wipers stop as going down road


It sounds like you have a charging problem or your battery is shot. Check your belts and your battery, if they're both good be sure all your grounds and battery connections are good (no corosion or loose connections- especially the ground points at the engine.) If you're still having problems you could need a new alternator or voltage regulator.

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Odds are your alternator brushes need replacement.. Good bet here is to find a 79 up GM alternator (with the internal regulator) to fit the bracket an a minor wiring will solve this problem.

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Does jeep nwrangler (1998) 4.o litre with air have a voltage reulator that if bad would stop alternator from putting charge into battery? and where is voltage regulator located?


The voltage regulator it in the ECM.What you need to do is go to the basic which can be overlooked like is the Alternator fuse burnt open that will require a new fuse, how is the battery terminal connection? You need to check that,Or how is the calbe from the alternator to the Battery is the connection in good shape? Those you need to check you mainly need a voltmeter to do this but a good visual inspection can get results,

Nov 23, 2012 | 1998 Jeep Wrangler

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Ive got a 1988 ford ranger,it strated to stall not run popped when tried to apply fuel,went bought fuel filter pump,install samething,pull voltage regulator plug truck runs fine, so go buy new alt with...


Interesting.
You may need a wiring diagram for the engine.
Unplugging the regulator turns off the alternator which should not affect the ignition system. Unless it is over charging somehow. Or the alternator load on the engine is causing a missfire to be worse.
Its possible you have a ground problem somewhere too.

Jun 29, 2012 | 1988 Ford Ranger

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Charge light was on and alternator was overcharging. had alt. rebuilt and new voltage reguator, not charging now. only getting 2 to 3 volts are the charge fuse beside battery. new voltage reg is electronic...


There is a fuse under the dash that is the same one that operates the fuel gauge, if it blows the alternator wont charge. If the fuses are good I would take the alternator off and get it tested. Hopefully the rebuilder will warranty it. I would also make sure the new regulator is compatible with the old type regulator system. Most large auto parts stores can test alternators, and they normally do it free.

Dec 18, 2010 | 1984 Toyota Pickup Deluxe

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Stayter going to voltage reg 3 wires go to what on reg


The stator only has two wires if it's an original stator. The pigtail from the stator has two wires inserted into a round plug, The regulator has three wires. There should be two short wires and one long wire. Or , two smaller wires and one larger wire. The two shorter, smaller wires go to the stator, The longer, larger wire goes to the battery from the regulator.

If your stator has three wires coming out of the engine case, it is probably a 3-phase stator which is available aftermarket. It take a special voltage regulator for this type of stator. That voltage regulator will have four wires coming from it.

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Aug 14, 2010 | 2003 Harley Davidson FLSTF Fat boy

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My battery wont charge and I just bought it


Hi and welcome to FixYA,

Two possibilities:
  • rectifier / regulator combo (most likely);
  • corroded, burned, loose connection from the stator to the regulator (likely);
  • faulty stator (least likely).
The stator would be producing relatively high AC voltage while revving the bike. The stator output AC voltage are fed to the rectifier / regulator through 3 white wires. Check calls for testiing for the presence of the AC voltage on any pairing of the white wires before and after the connector before the voltage regulator. Check on the regulator calls for checking the battery voltage when revving the bike (14.5 VDC).

Good luck and thank you for asking FixYa.

Jan 04, 2010 | 2002 Yamaha YZF Thunder ace 1000 R

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Recently having problems with my 2000 Fatty not holding charge. What should stator be putting out on voltage meter? Voltage meter climbs as rpms go up, I would presume that this indicates stator ok? Bike...


First, take your battery somewhere and have it load tested. Fat Boys are tough on batteries as the battery sits in the "horseshoe" oil tank and is subjected to high temperatures due to the hot oil in the tank. Battery life is typically two years although I've seen some go longer and some not last that long. Have the battery tested before you start spending money.

To check the stator, you unplug the regulator at the engine case. Down inside the plug you'll see some electrical connectors. Connect a DVOM (digital volt ohm meter) to these connectors (one lead to eac pin) and put the meter in the 50 volt or higher range AC voltage. This is important that your meter be set to measure AC voltage because at this point, the voltage is indeed an Alternating Current voltage coming out of your alternator. Start the engine and bring it to a high idle. You should be reading over 20 volts AC. The book says that you should read 12-18 volts per 1000 engine RPM. If your engine is turning 2000 rpm, your meter should read 24-36 volts AC.

To test the regulator, first charge your battery to a full charge. Then connect your DVOM across the battery, red to positive, black to negative. Put the meter in the 20 volt DC range. Start the bike and bring it to a high idle. The voltage will start at somewhere around 12.5 volts and climb to about 14.5-15 volts. This would indicate that the regulator MAY be alright.

Now, have you changed any of the lights on your Fat Boy? I've seen people change and add lights to the point where their alternator could no longer put out the current necessary to handle the load. If this is the case, you may need a higher out charging system.

I don't know where you're located but $260 seems quite high for a voltage regulator.

Dec 30, 2009 | 2000 Harley Davidson FLSTF Fat boy

1 Answer

I have a 79 650. Been having trouble keeping a charge. bought a new stator but didnt help. bought a new battery that didnt help either. ?


well what you need to do is take volt meter and start the bike see if you are getting 13,5 volts at battery or more if not hold throttle at 1500 rpm and see what you have if you do not have this volts coming to battery it could voltage regulator or stator is bad but check all grounds to bike and wiring hope this helps

Oct 06, 2009 | Yamaha XS 650 B Motorcycles

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