jer
Scoot Member
Posts: 81
Location: Wyoming-Silicon-Genessee Valleys
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Post by jer on Jan 10, 2019 10:21:36 GMT -5
honestly though. i'd personally just put a battery in it and see if the d/c battery connected, lined everything out or if everything worked correctly. Sure, I'll pop it in and repeat the voltage tests, that won't harm my new battery, not for a minute or two at most. My prediction is that it won't correct the issue but it may yield some screwy test results because if the DC voltage is lower than battery voltage, which it is, current will flow in the opposite direction unless it runs into a diode (rectifier.) The AC voltage won't even know the battery is there.
I may not be able to do this today because I have an appointment at noon and tonight is Scouts. I should be able to do it on Friday.
TO BE CONTINUED...
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Post by harleyracer59 on Jan 11, 2019 1:00:40 GMT -5
Since these things usually have a half wave rectifier it will read as an ac current on a voltmeter as it’s effectively swapping from zero to whatever with each turn of the flywheel. Thomas nailed what I was trying to say, I just didn't say it as well... anyways, the half wave part is whats going on. with nothing to hold the created charge voltage/ wattage, when the other half of the wave is dropped instead of being converted to a positive charge or watt. so on your meter would see 0,12,0, ect and you can get a -0, 0 when disconnecting from power. connect your battery and see what happens.  |
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jer
Scoot Member
Posts: 81
Location: Wyoming-Silicon-Genessee Valleys
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Post by jer on Jan 11, 2019 10:28:16 GMT -5
Well, I find it very interesting: this half-wave rec issue. I think I agree that it could mess with the meter's reading. I want to have a look at the actual waveform. I'll need to dust off my O-scope and dig up a suitable probe, (scopes use BNC connectors) because I've moved all my equipment to a new location. But that will be a separate endeavor.
I checked the battery before installing: 13.3vDC 0vAC. Installed w/ engine running: 12.1vDC 4.5vAC. Both DC & AC readings held steady while operating the throttle from idle to 1/3. I didn't see the need to rev it any further. I re-checked the battery after removing: same as before installation.
So the leg shield is next, if not today, tomorrow.
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jer
Scoot Member
Posts: 81
Location: Wyoming-Silicon-Genessee Valleys
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Post by jer on Jan 11, 2019 13:51:04 GMT -5
I ended up removing the nose piece to access the components in that area. The Reg/Rec was there. It has a CPI logo with A3202 printed right after it. This exact same marking was on the CDI box. The other number is J20REE. It has 5 conductors coming out of it and it also has a 6 pin (3x2) female connector on a 6 inch pigtail. When I look around for a replacement, I've seen several except the sequence of the wiring is different on all of them. I know the order that matters is how the wires are arranged in the connector but none of the listings display that view. I suppose I'll need to start calling around to the vendors that have fone numbers listed.
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Post by gsx600racer on Jan 11, 2019 14:40:48 GMT -5
Well, I find it very interesting: this half-wave rec issue. I think I agree that it could mess with the meter's reading. I want to have a look at the actual waveform. I'll need to dust off my O-scope and dig up a suitable probe, (scopes use BNC connectors) because I've moved all my equipment to a new location. But that will be a separate endeavor. I checked the battery before installing: 13.3vDC 0vAC. Installed w/ engine running: 12.1vDC 4.5vAC. Both DC & AC readings held steady while operating the throttle from idle to 1/3. I didn't see the need to rev it any further. I re-checked the battery after removing: same as before installation.
So the leg shield is next, if not today, tomorrow.
Been there done that.(O-scope testing) 49ccscoot.proboards.com/thread/23838/waveform-voltage-charging-circuit49ccscoot.proboards.com/thread/23834/stator-waveform-white-yellow-oscilloscope49ccscoot.proboards.com/thread/23833/trigger-pulse-signal-looks-oscilloscopeAs for your AC measurement while the scooter is running, your meter is going to see the DC + pulses created from the rectifier seeing that the rectifier is scrubbing/removing the -AC from the sine wave. What is the battery voltage when its connected(key off)? If the voltage is dropping as soon as you connect the battery when the scooter is not running(key off), that means the regulator is bad(diode). The voltage drop is from power going all the way back to the stator windings. If you took the flywheel off, one/several if the windings would become electromagnets when the battery is connected. The bad diode in the R/R is not blocking the reverse flow of current from the battery to the stator. |
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jer
Scoot Member
Posts: 81
Location: Wyoming-Silicon-Genessee Valleys
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Post by jer on Jan 11, 2019 15:23:23 GMT -5
What is the battery voltage when its connected(key off)? Darn, I just left the service bay, I'll go back later this afternoon and pop the batt in to measure (connected, key off.) I just can't remember if I did that or not, well no trouble double checking. |
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