Charging system not working

[BikerMatt]

Hi all..

Been dumped with a 2007 "Hyosung rx 125 sm" that wont charge the batt..

so far the alternator has been replaced and tested

as well as the reg/rec (replaced and tested)

and a new batt (charged fully before installed and holds charge)...

still wont charge..

I have checked the loom and nothing..

the battery is getting AC while running but not DC

I'm boned

[RhynoCZ]

First thing to check, did you set the multimeter to DC?

Second, how did you test the alternator? - Find 3 yellow wires coming out of the engine and measure one with another using AC, when the engine runs, there shall be voltage (from 40v to 60v).

Third, if you get AC on the battery, the rectifier is burned/corrupted.

Fourth, is this a magician's motorcycle?
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[BikerMatt]

[Wull]

Biggest mistake was buying a Hyosung
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"Scooters are for men who want to ride motorcycles but prefer to feel the wind on their vaginas"

[RhynoCZ]

Alright, get a new reg/rec, don't run the bike like that, AC going into the battery will kill it.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[BikerMatt]

[BikerMatt]

[RhynoCZ]

To be honest, I've no idea.

The reg/rec may be even faulty right out of the box. The only two reasons why a reg/rec gets burned/corrupted are heat and vibrations. There are no mechanical parts in the reg/rec. Also there are no other electronic parts I could think of, that would be between the reg/rec and the alternator itself. The alternator is just a stator (coil made of copper wire) and a moving magnet.

TL; DR, if the alternator is alright, then buy a new reg/rec, or ask a mate to lend you his. I once did test with CBR919RR reg/rec in my CB-1 and vice versa, worked the same.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[ZebraDriver]

This might help

https://www.crowitis.com/images/fault_finding.pdf

ZD

[Rogerborg]

[Wull]

No worries mate,glad to be of great hep to you

Tbf everyone on here is electrical geniuses so I thought it would be better to let them help you.
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"Scooters are for men who want to ride motorcycles but prefer to feel the wind on their vaginas"

[BikerMatt]

Headaches and a half lol

Brand new rec/reg done nothing

[Rogerborg]

Are you going to keep throwing more money down that hole?
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[BikerMatt]

[bikenut]

ok matt just seen.....wiring diagram have you.....have 250 twin wiring diagram for wire colours .....back 2morrow as time up nearly and stuff at home....is there a wiring diagram on here?? see suggestions for colours .............still ac at the battery??

its a 125 does the headlight have ac lighting with dc for the side lamps etc??
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nuts about bikes

[P.]

[Rogerborg]

[ferrisio]

[bikenut]

https://i574.photobucket.com/albums/ss182/hmmmnz1/Hyosung/rx125.jpg

this is on this site in the manuals/wiring diagrams section ( brilliant to whoever put these on here, brilliant and amny many many thanks dude ) )

notice the charging wire from the reg/rec it fused...........no black load sensing wire..........

headlights appear to be dc powered not ac......

the only ac on this diagram is from genny to reg rec..........some from ign pickup but thats a different system........

I presume that the reg rec has 2 shrouded wire clusters coming from it.....one shrouded cluster of 3 yellow wires going to the genny....and the other shrouded cluster having 2 wires....one going to earth ( eventually ) and the other to the battery positive via the fuse......again I presume these wires are not "connected" to each other via heat and fusion and a bare yellow is not touching a bare red.......?

the diagram is not brilliantly clear on the vdu screen (or is that my old eyes ) and takes some following.....where else other than the reg/rec and genny could the battery experience ac??

print the diagram off and study.....save for future reference.....

does the eng start and run more or less perfectly?? so no feed back or noise from the cdi??
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nuts about bikes

[BikerMatt]

Fixed

[bikenut]

cool what was it in the end??
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nuts about bikes

[P.]

[BikerMatt]

Guy put the wrong alternator in.. looks like a suzuki one, guess they must've thought it'd be compatible since it's suzuki like

[BikerMatt]

[bikenut]

well done matt!!!!

give your self a well deserved pat on the back!!

and another one for not giving in!

its a bike which now works, so enjoy. :karma:
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nuts about bikes