Charging System, Comments on my diagnosis please |
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Charging System, Comments on my diagnosis please |
HarveyH |
Oct 22 2011, 03:54 PM
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#1
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Member Group: Members Posts: 450 Joined: 19-June 03 From: Downingtown, PA Member No.: 843 |
Well, I've been having some charging problems. Cleaned all the battery connections. Checked the Voltage regulation and found it was regulating a bit low, 12.4 Volts. Also did a field test per various writeups on the site, voltage tracks RPM up to 16+ Volts at 3200 RPM.
Got a new electronic voltage regulator: it didn't regulate at all, voltage tracked RPM as with the field test above. Got another new electronic regulator . Checked regulation and it's not stable up to about 3100 RPM when it levels out at about 14.5 Volts. During runup it goes as high as about 15.4V. I'm still getting an alternator light Brand new battery installed. Continues as above. Cleaned the contact points of the old mechanical regulator and adjusted the vibrator points tension to get it to regulate at 14.5V. Much more stable than the electronic regulation at lower RPM's. Still get the alternator light. Bad diodes in the alternator????? (IMG:style_emoticons/default/headbang.gif) Thinking the poor stability of the regulation with the electronic VR is that it's more influenced by AC than the mechanical regulator. Thanks, Harvey |
HarveyH |
Oct 24 2011, 11:34 AM
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#2
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Member Group: Members Posts: 450 Joined: 19-June 03 From: Downingtown, PA Member No.: 843 |
Did the field test. At idle the voltage came up about 0.2V from engine off baseline. As RPM increases voltage at battery increases, stopped increasing engine speed at about 3100/3200 RPM, at that RPM voltage at the battery ran about 16.2V.
Didn't try {D+ DF} to ground, I'll check it this evening My DVM is a Sears autoranging unit with a single AC/DC Volts selection and I can get only get the DC component to show. Harvey |
plas76targa |
Oct 24 2011, 03:59 PM
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#3
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Senior Member Group: Members Posts: 885 Joined: 22-February 04 From: Frederick, MD Member No.: 1,700 Region Association: MidAtlantic Region |
Did the field test. At idle the voltage came up about 0.2V from engine off baseline. As RPM increases voltage at battery increases, stopped increasing engine speed at about 3100/3200 RPM, at that RPM voltage at the battery ran about 16.2V. Didn't try {D+ DF} to ground, I'll check it this evening My DVM is a Sears autoranging unit with a single AC/DC Volts selection and I can get only get the DC component to show. Harvey Check your ground strap to the transmission? I had similar problems several years ago shortly after purchasing my car. tried regulators, cleaned the grounds as best i could, pulled the alt and had it tested, no improvement. Some one here suggested replacing the relay board, I did and problem went away. clean the contacts on the relay board or replace. hope this helps. |
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