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regulator help
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Bmtt
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Joined: May 10, 2008
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PostPosted: May 10, 2008, 10:15 pm    Post subject: regulator help

Is there some way to test a regulator to see if its good and should i be getting 12 volts out of the brown wire, because I'm only getting 10.

Its a 78 special

Please help!
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Retiredgentleman
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Joined: Mar 03, 2007
Posts: 2258
Location: Calgary, Alberta 1978 XS650 SE

PostPosted: May 10, 2008, 10:34 pm    Post subject: Re: regulator help

Just put your voltmeter across the battery terminals. With bike off will have about 12.5 volts. Start bike, will have about 13.5 at idle. Rev engine to 2500 RPM, shoud have about 14.5 volts if regulator is working.l
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jayel
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Joined: Apr 16, 2006
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Location: SE Iowa 1974 TX650A

PostPosted: May 10, 2008, 10:47 pm    Post subject: Re: regulator help

mechcanical regulator, use a Ohm meter to test black wire to ground should read 0 (no connection) then brown to green 0 (with points of reg. in normal posistion (center touching top contact) (center and top closed) with center contact not touching either contact 9 - 10 ohm, when center contact touchs bottom contact 7- 8 ohms, then brown to black with center contact in normal posistion (touching top contact) 36 - 38 ohms
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Bmtt
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PostPosted: May 10, 2008, 10:57 pm    Post subject: Re: regulator help

jayel wrote:
mechcanical regulator, use a Ohm meter to test black wire to ground should read 0 (no connection) then brown to green 0 (with points of reg. in normal posistion (center touching top contact) (center and top closed) with center contact not touching either contact 9 - 10 ohm, when center contact touchs bottom contact 7- 8 ohms, then brown to black with center contact in normal posistion (touching top contact) 36 - 38 ohms

Thanks Retiredgentleman and jayel

Does the regulator need to be plugged in the the bike to do the ohm test?
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dpmphoto
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Joined: Apr 18, 2007
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PostPosted: June 6, 2008, 9:57 pm    Post subject: Re: regulator help

actually unplug it
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billysiddle
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Joined: Dec 24, 2009
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Location: UK

PostPosted: December 24, 2009, 5:34 am    Post subject: Re: regulator help

Bmtt wrote:
Is there some way to test a regulator to see if its good and should i be getting 12 volts out of the brown wire, because I'm only getting 10.

Its a 78 special

Please help!

Sorry im not able to help you ... Even one of my friend facing the same problem .. still now she didn't find the solution ........


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jayel
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Location: SE Iowa 1974 TX650A

PostPosted: December 24, 2009, 9:39 am    Post subject: Re: regulator help

there is info in the Vault forum that explain all about the charging system, how to test and what results to expect
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xsleo
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Joined: Oct 28, 2007
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Location: Earlville NY

PostPosted: December 27, 2009, 5:26 pm    Post subject: Re: regulator help

The Clymer book explains the testing on the mechanical regulator very well, has pics too.
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xsleo
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Location: Earlville NY

PostPosted: December 27, 2009, 6:10 pm    Post subject: Re: regulator help

Replacing your mechanical regulator with a solid state unit will be an easy upgrade.
A Chrysler regulator from the mid 70's to 80's can be bought from most any parts store most anywhere. Prices start at about $13, go up from there. I got one for $13.99 at Advanced Auto.
After you do this the voltage at the battery will be just right.
On my 75 I get 12.5 at idle, goes to 14.5 just of idle, maybe 1800 rmp. Never goes over 14.5 volts.

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