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How do I test the coil stator and the rectifier

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I doubt if anyone on fixya is a mind reader. What motorcycle are we working on?

Posted on Jun 11, 2014

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Posted on Jan 02, 2017

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SOURCE: bike hasn't been running for months. change of

First of all, when boost starting a bike from a auto make sure the auto is NOT running. The auto battery has more than enough power all by itself.

The most likely is 4) None of the above. The truck's charging system put more than 30 amps into the bike's electrical system and blew the fuse.

Get a new bike battery and fully charge it. Then go from there. If you really want to see if the bike will run before buying a new battery go ahead and hook up the cables to the truck battery and try it with the truck off.

A faulty alternator/regulator/rectifier should have no effect on the bike actually starting or turning over. Only the output of the charging system would be affected, possibly causing the bike to die when the cables are removed. My '78 Honda would not run at all without battery power, not sure if the Kawasaki is the same or not.

Posted on Jul 20, 2009

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SOURCE: wire connector between stator & voltage reg/rectifier burnt

your voltage/reg. can be tested in a couple different ways check ground res. check res. then revs. bias on diodes you have ac in dc out it sounds like you may have a diode gone bad allowing ac curent to flow causing the wires to get hot

Posted on Jul 31, 2009

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SOURCE: Alternator not charging battery on getting 11.5

I had the same problem with my 900 that I just bought, the regulator was fried, so the local kaw shop replaced it with a new one off internet, then it promptly fried the new one, upon further investigation the rotor/armature was reading 1 ohm resistance, supposed toread 4/7 i think anyway, had to have alternater rebuilt , cost 370.00 , works fine now.

Posted on Aug 06, 2009

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SOURCE: rm125 1999 no spark

what comes out of CDI box? if you have it going in it is rectified and more will come out. If not change CDI

Posted on Mar 07, 2010

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SOURCE: stator or rectifier

It is the little rectangular, silver or black thing with cooling fins and wires attache to the outside of your battery holder, under the left hand side cover. I've got a blue 84 GS1150EX.

Posted on Mar 24, 2010

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On a 2005 Suzuki C90t bike not charging. Stator and rectifier check out ok?

there is no test for a reg/ rectifier. stator can be checked for resistance and static tested for output. factory service manual will provide details. if stator passes both tests then replace regulator.

Sep 07, 2014 | Motorcycles

2 Answers

99 Kawi zx 900c won't crank or start, I've been told that it's either the stator or rectifier, how can I test these parts to be sure

The stator and rectifier are parts of the charging circuit, don't control motor operation. An ohm test will check a stator, you need specs to know what it should be. A rectifier changes ac to dc (I think) and has it's own test, which I forget.
Cranking and starting are battery and ignition and fuel things.

Nov 26, 2013 | Motorcycles

1 Answer

I've got a 07 Grizzly 450 that I just recently purchased, I took it out this weekend for it's first long ride and it quit charging. Where do I start looking for problems? Stator rectifier or both, Also is...

The best way is to purchase the service manual and follow the instructions. Otherwise you can use a volt meter and do the voltage test at the battery while the engine is running is should be 14 volts at 1000rpm. If this doesn't check out, you then have to find out whether it's the stator or rectifier. Check the ac magneto charging coil resistance (right at the coupler) with your testor set to ohms. If this test checks out then its the rectifier, if it fails then it's your stator. The best and safest way is to use the service manual to do any work yourself. Good luck!

Sep 15, 2013 | Yamaha Motorcycles

1 Answer

My 2005 road glide is charging erratic above 2000 rpm . at idle it charges normal. when going down the road you can see the lights go dim then brighten . it just started so i have not tryed to fix it yet ....

There is a module called a rectifier looks like a metal box with heatsink fins on it..this module rectifies the ac coming off the stator and then regulates it to run lights and charge the battery...first thing you can try is to obtain a voltmeter and put it on the battery..the value should be anywhere from 13.8 to 14.4 volts DC with the engine running ...try revving the engine and see if the voltage value may even try switching lights on and off to load down the circuit...the voltage should remain pretty steady, no matter what the load is...if it fluctuates more that a couple of volts then I would recommend either taking the regulator rectifier off and taking to a shop to see if it can be tested...or, just replacing the unit( these reg/rectifiers are not cheap). If you should have good luck and find someone who can test the module and it tests good , then you will need to use the voltmeter set to AC volts and test the output of the stator leads. There may be 2 or 3 leads coming off the stator and you will need to check between all 3...or 2...the voltage should be 20-30 volts at idle and will increase as you rev the engine..this will ensure your stator is working...another thing to try with the stator is to measure the resistance of the coils..they should be a very low ohm reading and you need to also check each stator lead to ground...there should NOT be continuity between any stator lead and ground...if all these don't solve, then I would start looking at the ignition components as something may be starting to fail and pulling down the circuit

Feb 02, 2011 | 2005 Harley Davidson FLTRI Road Glide

1 Answer

My 98 merauder discharges when it gets hot out

check wires from stator coil normally 3 the same colour disconnect plug and test from stator side wires should have continuity between each other but not to earth if no continuity or going to earth replece or rewind stator if tests ok run bike with headlight on light should get brighter as you slowly increase revs if however lights go brighter and then goes dimmer as revs increase replace regulator rectifier

Jul 18, 2010 | 2001 Suzuki VZ 800 Marauder

1 Answer

When idleing the lights go good but when you rev bike lights dim

Follow the leads that exit the crankcase from below carby area and thoroughly check all these connections to CDI unit and Rectifier and Ignition Coil. The wires also then follow thru' engine kill switch and lighting switch, others go to tail and brakelight switch. Are the wires being pinched at head stem or within handlebar switches. If all wiring/swithes and connections are in good order, you have some issues with your stator coils or pick-up coil inside left engine cover and behind the rotor, or the CDI unit. With some luck, the Rectifier or Ignition Coil may be guilty as these are relatively cheap to replace compared to stator coils and CDI. Get an auto. elec. multi meter check done. The Service Manual (info can be asked from Suzi dealer) has the Ohms resistance parameters to test against. Goodluck, and Cheers.

May 12, 2010 | 2001 Suzuki DR-Z 400 SE

1 Answer

I have changed my stator and cdi box on a 1999 polaris xplorer 400 i have one spark at the begin of starting but its not contounious how do i test the regulator rectifier

According to my polaris manual, is says'' The regulator / rectifier is tested by process of elimination ( when all other possable causesof chargingsystem failurehave been checkedand eliminated, the rectifier is defective). I had to replace my stator and then had a simular problem as you have and it was that the ignition pulse coil wasn't properly guaged ( sometimes the metal retainer will allow slight movement) You might want to also check the coil resistance 0.3 to 0.5 ohms the coil secondary resistance spark plug cap installed 11,300 ohms spark plug cap removed6300 ohms. Hope this helps out. Good luck

Mar 26, 2010 | Polaris ATV

1 Answer

Rm125 1999 no spark

what comes out of CDI box? if you have it going in it is rectified and more will come out. If not change CDI

Feb 25, 2010 | 2003 Suzuki RM 125

1 Answer

Wire connector between stator & voltage reg/rectifier burnt

your voltage/reg. can be tested in a couple different ways check ground res. check res. then revs. bias on diodes you have ac in dc out it sounds like you may have a diode gone bad allowing ac curent to flow causing the wires to get hot

Jul 28, 2009 | 2002 Yamaha V Star 1100 Custom

1 Answer

How do you change the alternator on a 1997 honda goldwing motorcycle

hello and welcome
the alternator per say is split up into several components. the stator coil(located in the left crankcase cover) and the rectifier regulator (which is located bolted onto the frame above the stator area. you can identify this by three yellow wires going into it.
either one can be tested the regulator can be tested at a local dealership. and the stator can be tested by reading an ohm meter between either one of its three wires and ground. if any show up with any continuity between the unplugged yellow wires at the stator and ground the stator is at fault. thank you.

Mar 21, 2009 | 1990 Honda Pacific Coast

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