| ignition switch on no alt. sense power [message #347691] |
Wed, 11 September 2019 16:22  |
Lhockman
Messages: 5
Registered: February 2019
Location: Alamogordo NM
Karma: 0
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Junior Member |
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I have 12v at alt. sense with ignition off, and no power when ignition in on position. This causes the alt. to output high voltage. Has anyone seen this problem or cure?
I am not sure about the brown wire on the exciter/sense wire (I thought it would be a ground (mistake) ) I used it as a ground while checking the voltage at this connector. Well after checking further I found that the voltage on the white wire is 12 volts to a good ground, after starting engine the voltage at the connector goes up to over 14 volts, using a good ground. OK, the problem is that the alt. is outputting over 15 volts (seems to be too high). Can someone explain this circuit.
1977 26 foot, royale
Alamogordo NM
[Updated on: Wed, 11 September 2019 17:33] Report message to a moderator |
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| Re: [GMCnet] ignition switch on no alt. sense power [message #347695 is a reply to message #347693] |
Wed, 11 September 2019 18:38  |
Lhockman
Messages: 5
Registered: February 2019
Location: Alamogordo NM
Karma: 0
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Junior Member |
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Thanks, for all the info. I also found a miss wire onthe isolator. Seem to
be working fine now.
On Wed, Sep 11, 2019, 4:52 PM Bruce Hislop via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Brown wire is the field excitation voltage to get the alternator starting
> to produce power. It has an in-line 10.0 ohm resistance and if you were
> using it for ground on your voltage measurements, that's why it looked
> like the voltage sense line (white) when to ) volts (they both had 12V on
> them!
>
> The brown wire should have something less than battery voltage with the
> key set to Ign. Wite wire should have battery voltage on it.
>
> When running, if you have an Isolator (as OEM) then the output of the
> alternator should be 0.7 volts higher than the battery voltage.
>
> --
> Bruce Hislop
> ON Canada
> 77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
> http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
> My Staff says I never listen to them, or something like that
>
> _______________________________________________
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1977 26 foot, royale
Alamogordo NM
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