Re: charging question
[Re: Andrewh]
#1435326
05/12/13 08:43 PM
05/12/13 08:43 PM
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Joined: Apr 2013
Posts: 22 Indiana, USA
sandberg
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OP
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sorry, single field, 66 charger, solid state vr. taking readings at the field side of alt and the field side of vr with a volt meter. have battery power at alt battery stud and battery with car off, no where else. with car running, i have 12.2 or so at battery, alt battery stud, ignition side of vr., ballast resister. then 11 or so volts at both alt. and vr. field connections with car running. if i should be getting like 13 or 14 volts at both fields with car running and i'm getting 11 does that mean the vr. is bad? had the auto store check the alt and they said it was good.
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Re: charging question
[Re: sandberg]
#1435329
05/12/13 09:41 PM
05/12/13 09:41 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
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Posts: 14,889
up yours
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The stock regulator in the early setups is nothing more than a switch, on/off/on/off etc. It essentially pulse width modulates the alternator. These are adjustable, look in the FSM to see how to adjust them.
I don't know how the aftermarket electronic version does it's thing, that might be what Andrew is talking about.
The "bad" VR probably has a blown fusible link inside. It is fixable.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: charging question
[Re: sandberg]
#1435333
05/12/13 11:55 PM
05/12/13 11:55 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Posts: 36,041
Lincoln Nebraska
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IF the alt is good & the reg is good all you need for the early system to charge is (1) switched 12V to the "ign" (blue wire) reg terminal. (2) continuity between the reg field terminal (green wire) and the alt field terminal. (3) the reg base is grounded. I'm assuming this alt only has 1 field terminal (if two (later alt) just ground one of em to alt case)
live every 24 hour block of time like it's your last day on earth
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Re: charging question
[Re: Supercuda]
#1435334
05/13/13 09:29 AM
05/13/13 09:29 AM
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Joined: Feb 2003
Posts: 8,692
Andrewh
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Quote:
Quote:
you are confused. the sensing line should get 12 volts or whatever you get at the battery, based on good grounds to the box and a good clean line for power.
out put of the vr is not going to be the same. or why would you need a voltage reg?
it converts the voltage to another voltage for the alternator to generate power against. it changes the field strength of the alternator by varing the voltage it sends.
Stock early VR does not vary the voltage to the alternator field. It does a primitive pulse width modulation. Full on - full off are the only two choices with time on and off being what is variable. With a meter you might not see it, with a scope you will see it.
while that is true, op does state above using a solid state VR, not the old style. there fore it will show specific voltage. not 12 volts on and off.
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Re: charging question
[Re: Andrewh]
#1435335
05/13/13 04:37 PM
05/13/13 04:37 PM
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Joined: Apr 2013
Posts: 22 Indiana, USA
sandberg
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so here is were i am. with car off i have 12.2 volts at battery. i ran the car with lights, highbeams, heater, radio, brakes, and turn signal and the battery was at 11.5 or so and the field was at 10.2 and a little higher while it was switching for the turn signal. i let it idle like that for maybe 10 or so minutes, turned the car off and the battery was at like 12.1 or so. started the car 4 times in a row to see if the battery would turn it and it started everytime. one thing i do see is that i have a factory alt gauge in my cars dash cluster, and with all of the accessories on it dips to less than 1/4 of power on the gauge, giving it rpms doesn't change the alt gauge or the volts on the meter. does this make any sense? any help is appreciated. JZ
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Re: charging question
[Re: sandberg]
#1435336
05/13/13 10:41 PM
05/13/13 10:41 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Lincoln Nebraska
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Take the field wires (both) off of the reg. Jump fire from the alt "batt" stud to the male alt field terminal. Start car (3 seconds only just long enough to take a voltage reading) with all bulbs/headlights/accessories off. If charging (13.8+) the alt is good & the other end of its' field circuit (alt case) has continuity to ground/batt neg). Stop the eng & replace the blue wire on the reg. You stated earlier that you have switched 12V to that blue wire "ign" side of the reg. Run a jumper from the "field" green wire side of the reg to the alt field male terminal & restart it & if it charges (3 seconds max) then green wire you bypassed has an open. If it dont charge then the new reg is bad (or not grounded & I think we checked that).
live every 24 hour block of time like it's your last day on earth
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Re: charging question
[Re: frank]
#1435339
05/14/13 09:48 PM
05/14/13 09:48 PM
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Joined: Apr 2013
Posts: 22 Indiana, USA
sandberg
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well let me just tell you this. i had everything hooked up ran it at idle for 10 minutes with everything on, alt gauge was a 1/4 but everything seemed ok. drove it for a while with lights on so i'd get an extra draw, alt gauge was at 1/4 no movement on it at any rpms. i am getting a reading at the field the whole time (it's always less than what the battery reads). this morning decide since i'm not draining the battery and nothings dying that i'll drive it to work. nothing changes until i'm almost out of my neighborhood, then my alt gauge spikes all the way to full power and it's rpm sensitive. limp it home so it doesn't stay full on power. get home and start it, exactly the same as before, no movement at the alt gauge and no movement at any rpms. i'm so sick of this. battery checks ok, alt checks ok, two vr's one which is a year old doesn't work anymore and who knows about the other which is brand new. i have replaced any and every wire that was suspect over the last 2 years, in dash and engine compartment. i've bypassed the bulkhead connection with my main power wires just to be sure. ran an extra ground wire from the alt just in case. no wires at this point are melting or seemed to be problematic. yet every year i have the same charging troubles. is there anyway i can upgrade this system or anything so i can be done with this headache? JZ
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Re: charging question
[Re: RapidRobert]
#1435341
05/14/13 10:46 PM
05/14/13 10:46 PM
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Joined: Feb 2003
Posts: 8,692
Andrewh
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your new vr is broken. it should be inversly proprtionaly to the battery voltage on the output. http://www.autoshop101.com/trainmodules/alternator/alt131.htmlit is regulating the magnetic field. if it sees a high voltage at the battery, it should reduce the voltage at the output to lower the magnetic charge. if it sees low voltage at the battery, it should increase the field strength by upping the voltage.
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