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Re: 71 B body charging system woes [Re: peabodyracing] #2073830
05/15/16 01:46 PM
05/15/16 01:46 PM
Joined: Aug 2015
Posts: 23
The Netherlands
Luigi Offline
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Luigi  Offline
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Shame on me... blush
Car also wouldn't crank with disconnected alt....
Charged the battery, altough it was reading 13.5 volts, and vrooooem..
Gonna change battery annyway and then back to the overcharging issue.
To be continued..

Re: 71 B body charging system woes [Re: peabodyracing] #2080819
05/26/16 06:18 PM
05/26/16 06:18 PM
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The Netherlands
Luigi Offline
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Luigi  Offline
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Next episode:

Got the time to work on the overcharging issue today. Did all the tests mentioned above and think everyting is ok, except still overcharging, 15 to 17 at idle, running up to 18 volts with increasing rpm !!
Went back in my thoughts when this all started. A few months back I pulled out the alternator to connect a extra wire directly to the starterrelay.
One of the bolts broke and had to drill it out of the alt and make a new thread in it. I noticed then that I slightly hit the windings of the alt while drilling out the broken bolt. Now the windings are a bit damaged, so could thát be the reason of overcharging ?? that the windings are internally short now? Just guessing..

Luigi

Re: 71 B body charging system woes [Re: Luigi] #2080835
05/26/16 06:40 PM
05/26/16 06:40 PM
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Posts: 36,040
Lincoln Nebraska
RapidRobert Offline
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Yes change out the alt. DO NOT run it until you do as that high of voltage will wreak havoc in short order


live every 24 hour block of time like it's your last day on earth
Re: 71 B body charging system woes [Re: RapidRobert] #2080883
05/26/16 08:11 PM
05/26/16 08:11 PM
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Luigi Offline
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Originally Posted By RapidRobert
Yes change out the alt. DO NOT run it until you do as that high of voltage will wreak havoc in short order


I will not run it for the time being.

Disconnected VR while engine running : 14.5 volt at battery
Disconnected green wire from alt : 14.5 volt at battery

Still a bad alternator?

Googled around about this and read something that a bad battery can also cause overcharging. I haven't changed the bat yet because I first want to solve the overcharging issue...

Re: 71 B body charging system woes [Re: Luigi] #2080919
05/26/16 09:16 PM
05/26/16 09:16 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert Offline
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yes a bad/sulphated batt can force it to overcharge cuz it wont take a charge so the reg responds by upping the voltage to try & make it charge but if it is being charged to that level (14.5) its gonna stay there for awhile I'm thinking when you disconnect the reg. yes if you can borrow a known good fully charged batt, sub it in for a quick test then you will know before you shotgun money for another alt. (but I'm still thinking alt). EDIT All your connections are clean and tight (including the ground paths)?

Last edited by RapidRobert; 05/26/16 11:10 PM.

live every 24 hour block of time like it's your last day on earth
Re: 71 B body charging system woes [Re: peabodyracing] #2084793
06/02/16 07:32 PM
06/02/16 07:32 PM
Joined: Aug 2015
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The Netherlands
Luigi Offline
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Luigi  Offline
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Posts: 23
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Last episode:

Changed the voltage-regulator.....
Solved the problem, engine is running fantástic !! with the right values on the voltmeter..
As often, things are much easier to repair then we mostly think.. up

Luigi

Re: 71 B body charging system woes [Re: Luigi] #2084848
06/02/16 09:36 PM
06/02/16 09:36 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert Offline
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Quote:
Solved the problem, engine is running fantástic.
As often, things are much easier to repair then we mostly think.
(1) good deal (2) over here we call that the K.I.S.S. principle (Keep it simple Sam)


live every 24 hour block of time like it's your last day on earth
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