Question about 2002 TM Racing E 125

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Wireing diagram for reg/rec - 2002 TM Racing E 125

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  • chivos May 24, 2011

    this particular bike has no battery and the reg/rec is a replacement ducati 81031208 four pin over the original ducati 343301 three pin can you help please

  • chivos May 24, 2011

    This bike has lights blinkers etc already and road rego i was trying to get everything working but has no battery and the original reg/rec burnt out .I haye lights blinkers horn etc working but to much voltage as the light bulbs will blow

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  • Master
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Most regulator rectifiers have 2 leads coming from the stator(alternator) which are the wires that contain the ac voltage that the reg/rect converts and regulates to both charge the battery and runvarious accessories...usually they are both the same color coming out from the stator and the the reg rectifier has 1 lead that goes to the switched ignition to charge the battery...the grounding for the system is usually provided through the case of the reg/rect and also the stator is internally grounded....so you should have two leads going to the reg and one lead going to the battery and the ground is the case

Posted on May 24, 2011

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  • Master
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You will have three wires the same color (yellow is most common) coming from the case those three go to the reg/rec. the reg/rec will have five wires three wires of the same color a red and black, or a four wire three wires the same color and a red. the three from the motor are your charging wiresthey go to the three wires on the reg/rec. the odd wire is your pos. wire to the battery if you have one that has five wires one is your pos. on is neg. if you need anything more let me know.
M.Woodring

Posted on May 24, 2011

  • mark woodring
    mark woodring May 24, 2011

    what are you doing to the bike that you need a reg/rec? if your putting lights on it baja makes kits for almost anything. the less you put on the bike the less there is to go wrong. fill me in on what your planis are for the bike and lets see if we can find an answer that suits your needs, mean while ill look into the reg/rec you have.

  • mark woodring
    mark woodring May 24, 2011

    trail tech makes a really nice reg/rec it will work better for what your trying to do. its 40 bucks come with what you need a small unit that mount easy. save yourself the time and pain of trying to wiring in the duc part. i'm not saying that you can't but the time you'll save and ablity to change parts with no problem if the new one goes out. hope that you follow me advise. look down the road and money and time you will save if you need to change it out later. you can also get a small 12 volt battery to mount in there as will.

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2 Answers

My plug for that goes to my regulator rectifier fried so now I have to hard wire it. I just don't know what colors go to what. I read the diagram but I have a aftermarket regulator so the colo


How many wires are on the loom to it? And what colours are they.a typical amount is 5
3 yellow or white wires these don't matter which way around they go,the next would be black-and-white and the next red.red goes to the battery and black to earth.so if your new reg/rec has 3 the same then connect the 3 yellow/white to them .

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There should be 3 white wires on both the rectifier and the harness, if the one you switched it with is pinned different then youll still have the problem.

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It is more likely to be either the Regulatoer/Rectifier or the Magneto coils or pick-up. Your magneto sends a series of pulses at various revs. This is changed and evened out by the Reg/Rec. First step is to check quality of all connections from magneto upwards to all relevent components. IE; ignition coil, CDI unit, Reg/Rec, battery (if applic.). If the bike normally runs with a city light or running light when ignition is on, then check all switches for crossed, pinched or broken wire connections, especially around headstem area. Ideally, a service manual with relevent ohm resistance figures and a multi-meter should lead you to the problem. CDI units, Reg/Rec, Magneto Coils and pulse coils are very expensive as are ignition coils. They will all be affected eventually if the problem is not identified and fixed. Goodluck.

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yes there is a couple of different ways to test these components,first you will need a voltmeter and the first test is an ohms (resistance) test unplug the stator and place the meter leads on the stator leads 1and 2 then 1and 3 then 3 and 2 should read between .2 and 2.5 ohms then do an insulation breakdown one lead to stator lead the other to ground should read OL or OFL if any reading stator is junk. Then test out put meter to ac-volts meter leads to stator leads start the bike should read 15-100 vac. Then as far as the reg/rec goes set meter to diode mode and place one meter lead to the power output and the other to the stator input side of the connector do this to all three wires and then rev. the meter leads and do again 0.3-0.8 forward bias OFL in rev. bias then place meter lead to ground wire on reg/rec and do the same test if you get readings in both forward and reverse bias the reg/rec is bad replace

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I need the wiring schematic ? not just a diagram (I need to know where the wires go and their connections)- for a 1987 Suzuki Intruder 1400 Motorcycle I think my problem is with the alternator - but I need...


dont worry about the diagram. coming out of the motor you find 3 yellow wires they come for your stator. take a mutli meter and check to see if any of those 3 wires a grounded. if not start the bike and check for ac out put. the wire go to your reg/rec. if your getting a ac out put you reg/rec. maybe bad.

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2 Answers

My hayabusa is still not charging the battery after the mechanic change the stator.


you may have a faulty reg/rec as well but get the wiring check to the reg/rec to.

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you have a charging problem check the charging voltage should be around 13.50v if it lows you probley have a faulty reg rec or genrator test the coils of the genrator three yellow wires that plug in to the reg rec you should have restance of around 0.8 ohms when cold and no continutiny to earth test that you have battery voltage on the red wire and that you have continutiny to earth from the green wire if all that is fine you have faulty reg rec

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May I suggest a trip to your local library. Cycle repair books should be in 646 stacks of reference.
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