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1980 kz 550 ltd 5 wires on new rectifier and 4 on old one 02 Jun 2022 16:53 #868074

  • Ivesy
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Hi everyone, newbie question for you.
Bought new regulator rectifier for my bike new one has 5 wires old one only had a 4 wire plug Rick's told me I could convert it to 4 wire.  There are 3 yellow a black and a white  how do I hook that up?
1980 kz 550 ltd

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1980 kz 550 ltd 5 wires on new rectifier and 4 on old one 03 Jun 2022 09:52 #868144

  • gd4now
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I do not mean to mislead you, but I think the 1980 models came stock with a single phase alternator ( 2 yellow wires from alternator to rectifier) and the new unit is make for a 3 phase alternator (3 yellow wires from the alternator to the rectifier) but it can be used for a single phase system but making use of 2 of the yellow wires. 
1977 KZ650 B1
Pods and Denco header


This is my Z

OLD KAW OWNERS SMILE ALOT
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1980 kz 550 ltd 5 wires on new rectifier and 4 on old one 06 Jun 2022 03:23 #868345

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 I believe you are correct. So I understand the extra yellow isn’t connect to anything just capped off?  
thanks 
1980 kz 550 ltd

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1980 kz 550 ltd 5 wires on new rectifier and 4 on old one 06 Jun 2022 09:32 #868356

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As I understand it yes, but there are others here who are more knowledgeable than I and will most likely chime in on the subject.
1977 KZ650 B1
Pods and Denco header


This is my Z

OLD KAW OWNERS SMILE ALOT

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1980 kz 550 ltd 5 wires on new rectifier and 4 on old one 07 Jun 2022 11:23 #868424

  • H1Vindicator
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3 yellow wires would be for a 3-phase. 2 yellow are single phase.  a 1980 550 could have had either one or the other charging systems.  the diagrams at partzilla differentiate between the two system & I don't think the reg-recs are interchangeable.  but not certain.

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1980 kz 550 ltd 5 wires on new rectifier and 4 on old one 07 Jun 2022 14:26 #868438

  • Scirocco
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You can use any but only 2 yellow wires of the recifier on your wiring harness and capped of the 3rd, it does´t matter.

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1980 kz 550 ltd 5 wires on new rectifier and 4 on old one 07 Jun 2022 18:10 #868461

  • TexasKZ
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How many yellow wires are coming out of the generator?
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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1980 kz 550 ltd 5 wires on new rectifier and 4 on old one 08 Jun 2022 15:19 #868516

  • martin_csr
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OP needs to list all of the wires.  He's saying his old voltage regulator has a 4-wire plug, but that might just be what's routed thru the connector & there could be an additional wire from the reg-rec (possibly white-red). loudhvx has wiring diagrams on his motorcycle stuff page.

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Last edit: by martin_csr.

1980 kz 550 ltd 5 wires on new rectifier and 4 on old one 08 Jun 2022 17:16 #868529

  • Ivesy
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Ok so I've done more reading on this forum... great stuff btw... the wires coming from the stator are putting out 26-29 ac volts at idle and 65 at around 4000 rpm.  The wires also get hot to the touch and the battery shows a discharge.  Once the bike cools off the battery is fully charged again unless you ride until it stalls. 
it is for sure a single phase stator. Not sure what to think.  
thanks for the replies and help 
1980 kz 550 ltd

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