RG 250 charging problem

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gramol · #1 Unread post by **gramol** » Mon Jul 04, 2005 12:51 pm

as title suggests battery is not charging. 11.7 volts at batt while idling. off idle voltage drops to as low as 6.0 volts. Always starts(kick) and runs good just eating headlights. not familiar with THIS motorcycle charging system at all. any info would help. wiring diagrams etc. thanks in advance

#2 Unread post by **dr_bar** » Mon Jul 04, 2005 4:18 pm

Without knowing the make or model... the most common problem is the Rectifier/Regulator(R/R). If it's pooched, you'll soon do your battery in as well. That's what happened to my brand new Yuasa battery last year, a lot of money down the drain on that one. If I had checked my charging circuit before buying the new one, I probably would have saved $200...

The other problem that could pop up is the stator... put it this way, I hope it's your R/R, it's a lot easier fix.

#3 Unread post by **dr_bar** » Mon Jul 04, 2005 4:31 pm

Typical cager charging system...

Typical motorcycle charging system...

The zener diode in the R/R transforms all the extra un-needed juice to heat, that's why there are cooling fins on the R/R. There are also generic aftermarket R/R's available for most bikes, they're usually less expensive, and more durable than the OEM part. Good luck on your wrenching.

kar_the_terrible · Tue Jul 05, 2005 4:57 pm

Hi,
I was having the same problem with my yam. it turned out to be a badly charged battery. While dr bar circuit diagram is right for a lot of bikes... some also have excited field windings rather than a permanent magnet. So that means a poorly charged battery is only going to drain ur system.

I hooked up my car battery (without the car running), and checked the voltage. Its a little lower than its supposed to be in this case 13.xx insteada of 14.xx ... but tht was coz of the larger batt in the loop... remember to disconnect your motorcycle battery first.

If you're get anything below 12.5 then its def ur charging system. my 2 cents.

TechTMW · #5 Unread post by **TechTMW** » Tue Jul 05, 2005 5:43 pm

What YEAR is the bike?

If you describe your charging system to me, I can tell you how to test the components if you have multimeter.

Things to know - How many wires are coming out of the Stator (and their colors) and how many wires are coming out of the Rectifier regulator (and their colors)

Also be aware in order to test a charging system you MUST have a fully charged battery to start - so, if the battery is not at "AT LEAST" 12.6 - 13.2 volts, you need to put it on charge. If the battery is not holding a charge while disconnected from the bike, it's bad.