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Makotosun

voltage regulator

  • tvrc18
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Replied by tvrc18 on topic voltage regulator

 I mounted mine under the light with a home made bracket. Has anyone tested this type? I see a few are using this style.
Last edit: 25 Aug 2021 16:48 by tvrc18.
25 Aug 2021 16:39 #11

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Replied by Enduro nut on topic voltage regulator

Thanks for posting that ebay listing RT325, i have a 74 and 75 DT250 that i want to get all the lightning working but just havent quite gotten to that stage yet. I assume that will work on pretty much all years and models from 68 to the late 70s?
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26 Aug 2021 06:49 #12

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Replied by Gr8uncleal on topic voltage regulator

"Thanks for posting that ebay listing RT325, i have a 74 and 75 DT250 that i want to get all the lightning working but just havent quite gotten to that stage yet. I assume that will work on pretty much all years and models from 68 to the late 70s?"

Yes, on the 6v bikes.
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26 Aug 2021 06:56 #13

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Replied by Enduro nut on topic voltage regulator

Awesome! so by having this will i be able to run a head light without a tail light or vise versa?
26 Aug 2021 08:47 #14

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Replied by Sneezles61 on topic voltage regulator

Think of it as an electric shock absorber.. It takes the large voltage spikes out.. (how large can a 6 volt get?).. Sparing yer wallet from procuring the vintage light fixtures...
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26 Aug 2021 10:40 #15

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Replied by Enduro nut on topic voltage regulator

The lightning is something im yet to really dive into which i plan to do this fall. From what little research i did last year and from what i think i understand is if im running the bike stock and say the back tail light burns out, the juice that normally goes to that tail light now goes to the rest of the lights causing them to blow if im not mistake? The regulator prevents that extra juice from going to the other lights.
26 Aug 2021 21:44 #16

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Replied by MarkT on topic voltage regulator

I look at it differently. 

Think of electricity as water flowing in pipes.  Voltage is the water pressure in the pipes.  Bulbs are like calibrated "leaks" in the pipes.  The bigger the bulb, the bigger the leak.

Stock Yamaha stator is fixed output pump.  System is carefully designed so the pump output and the "bleed off" of the bulbs is balanced so the pressure (voltage) in the pipes (wires) stays in check. 

If a bulb burns out, it's like that leak stops.  So now the pressure is higher in the pipes.  (When a bulb blows, the voltage is higher in the wires).  The higher pressure (voltage) in the pipes (wires) now blows another bulb.  And the pressure spikes higher.  It's like a chain reaction. 

The Yamaha one wire regulator is like an automatic pressure relief valve.  If the pressure starts getting too high, the regulator becomes a bigger leak which keeps the pressure from getting too high.  So now if one bulb blows, the regulator bleeds off the extra flow and the other bulbs won't get too much voltage and blow too.

Hope that makes sense.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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26 Aug 2021 22:14 #17

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Replied by RT325 on topic voltage regulator

Hey, i like that description.
On US models, correct me "MarkT?' i think tail light is running on DC from the battery. I guess if the battery is out of water or not in the system the regulator would still absorb the extra & save the tail light? as i'm thinking it then gets driven from the AC side--being charging side in this case, so regulator friendly?. Sorry, not sure how that reads--or if makes sense after a beer on empty tummy lol.
26 Aug 2021 23:35 #18

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Replied by MarkT on topic voltage regulator

Yes, in about 1970 US law required the taillight to be run off the battery.  Earlier US models have the taillight run off the engine with the headlight like your models on the other side of the world did.

My understanding is that even though the battery charge is a separate winding in the stator, the "black magic" in the stator works so that if say the battery goes bad and can't accept power, that makes more power available for the headlight... and *pow*, there goes the bulb. 

Many of us have had a battery go bad (battery is also like a crude regulator) in real life and have all the bulbs blow the first time the engine is revved up.

On my later bikes with regulators, I've had batteries go bad and none of the bulbs blow. 
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
27 Aug 2021 05:43 #19

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Replied by Enduro nut on topic voltage regulator

Good way to put it MarkT, it sounds like what i was saying is correct. As it stands right now i dont have a battery i just have the head light and tail light and i dont wanna blow the head light. So i guess ill order me up that regulator and give it a try. Ill have to get some blinkers down the road some day.
27 Aug 2021 06:50 #20

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