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Topic: Alternator Help

in Forum: C3 Electrical


Alternator Help

Posted: 8/27/05 6:09am Message 1 of 4
Former Member
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Kingston, TN - USA
Joined: 7/5/2003
Posts: 900
Vette(s): 1970 Vert Both Tops Kiesler 5 Speed Steeroids Rack and Pinion Stayfast Convertible Top
I have been rebuilding my alternator. I am sure I have every thing back together correctly but for some reason I am getting no output. With the car running, you can put a screwdriver to the back of the alt. and the magnetic field of the alternator will pull the scrwedriver in, so the alt. is doing its job. I pulled the alternator apart and have done some comparisons on the old and new parts. All comparisons have been done by looking to see that they are made the same and by using an ohmmeter. Everything looks to be the same. With an ohmmeter there is some difference with the regulator. The old regulator reads about 23K ohms and the new regulator reads about 37k ohms. Do you think this difference in resistance could affect the output of the alternator?

Either way, this morning I am going to put the old regulator back in with all of the new parts and see what happens. I am going to be it works. Wish me luck as I have had the alternator on and off about 4 times now and I am beginning to get tired of the on and off thing.



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Alternator Help

Posted: 8/27/05 7:21pm Message 2 of 4
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WICHITA, KS - USA
Joined: 6/17/2005
Posts: 19
Vette(s): 1981 Corvette Coupe, T-Tops, Dark Blue, Black Leather, Numbers Matching, 85K Miles, 350/4-Brl., Turbo 350 AT, PW, PL, Disc 4-Whl., AC, PS, P Driver Seat, AM/FM W/CD, Dual Exhaust, Alum. Factory Whls. W/RWL Radial Tires, Tilt/Tele., Mirrored Tops.
Sorry Man! That's the way it goes with these Old Dogs, but you have to Love It. Everthing I do on mine seems I have do at least twice. Good Luck would help if I was around.


Guitarpicking,Wrenchslinging, Partchasing, Womanwatching, Somebeach Somewhere!

Alternator Help

Posted: 8/28/05 7:39am Message 3 of 4
Former Member
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Kingston, TN - USA
Joined: 7/5/2003
Posts: 900
Vette(s): 1970 Vert Both Tops Kiesler 5 Speed Steeroids Rack and Pinion Stayfast Convertible Top
Well, I put the old regulator back in and the Alt is now functioning correctly. I have a 14.4 volt output at anything other than idle. I have heard of peoples alternators not starting to charge until a certain RPM, maybe around 2000 RPM. Maybe that was the kind of regulator that came in the rebuild kit I got as it was an upgrade to 100 amp from stock. Glad I got this one worked out, now I have to go and get the car aligned for the new Steeroids I installed. 


Alternator Help

Posted: 8/28/05 8:36am Message 4 of 4
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
There are certain alts. that won't put out @ idle, but mostly the ones on small car engines, which I don't think you have!
They do that to save a little energy, because the alt. takes power to work, but once the rpms are up above idle, the alt. puts out normally.
Sounds like you just got a bad v-reg. Glad you got 'er goin'


Joel Adams
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in Forum: C3 Electrical


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