chaseincats Posted July 4, 2023 Author Share #49 Posted July 4, 2023 55 minutes ago, Captain Obvious said: Thanks for the post haircut pic. Much better. So as for the test... Yes, the "T" connector is involved. When the problem is occurring and the alternator voltage is too high, try sticking a wire in the back of the "T" connector at the W/R wire and connect the other end of that wire to the other W/R at the BATT connection. Here's a pic of the back of my alternator. Jumepr the two W/R red wires together like this: By 'jumper' you mean take an ohm measurement with a multimeter, not stick a wire between the two, right? (please say ohm measurement) Link to comment https://www.classiczcars.com/topic/68393-alternator-overcharging/?page=5#findComment-654831 Share on other sites More sharing options...
Yarb Posted July 4, 2023 Share #50 Posted July 4, 2023 You didn’t give a measurement with the engine running that would give a voltage output. Link to comment https://www.classiczcars.com/topic/68393-alternator-overcharging/?page=5#findComment-654834 Share on other sites More sharing options...
chaseincats Posted July 4, 2023 Author Share #51 Posted July 4, 2023 18 minutes ago, Yarb said: You didn’t give a measurement with the engine running that would give a voltage output. Gotcha. I took it for a drive today and it was behaving, next time it misbehaves I will. Link to comment https://www.classiczcars.com/topic/68393-alternator-overcharging/?page=5#findComment-654837 Share on other sites More sharing options...
Captain Obvious Posted July 5, 2023 Share #52 Posted July 5, 2023 9 hours ago, chaseincats said: By 'jumper' you mean take an ohm measurement with a multimeter, not stick a wire between the two, right? (please say ohm measurement) I meant stick a short piece of wire between the two shorting them together. They are already supposed to be connected hard together inside the wiring harness. One of the working theories is that connection inside the harness has become questionable. If you're not comfortable just trusting some guy on the internet who says "Naaah. It'll be fine. Just short that junk together." I totally get it. Next time the problem comes up, just start by taking the voltage measurements from each of those wires to the alternator case. We'll go from there. Actually, the first thing you should do the next time the problem starts is to wiggle that "T" connector around on the back of the alternator and see if wiggling does anything. Then take the two voltage readings of the two W/R to case. 1 2 Link to comment https://www.classiczcars.com/topic/68393-alternator-overcharging/?page=5#findComment-654850 Share on other sites More sharing options...
chaseincats Posted July 5, 2023 Author Share #53 Posted July 5, 2023 1 hour ago, Captain Obvious said: I meant stick a short piece of wire between the two shorting them together. They are already supposed to be connected hard together inside the wiring harness. One of the working theories is that connection inside the harness has become questionable. If you're not comfortable just trusting some guy on the internet who says "Naaah. It'll be fine. Just short that junk together." I totally get it. Next time the problem comes up, just start by taking the voltage measurements from each of those wires to the alternator case. We'll go from there. Actually, the first thing you should do the next time the problem starts is to wiggle that "T" connector around on the back of the alternator and see if wiggling does anything. Then take the two voltage readings of the two W/R to case. Haha sounds good, I'll wiggle away! Link to comment https://www.classiczcars.com/topic/68393-alternator-overcharging/?page=5#findComment-654855 Share on other sites More sharing options...
chaseincats Posted October 15, 2023 Author Share #54 Posted October 15, 2023 On 7/4/2023 at 8:44 PM, Captain Obvious said: I meant stick a short piece of wire between the two shorting them together. They are already supposed to be connected hard together inside the wiring harness. One of the working theories is that connection inside the harness has become questionable. If you're not comfortable just trusting some guy on the internet who says "Naaah. It'll be fine. Just short that junk together." I totally get it. Next time the problem comes up, just start by taking the voltage measurements from each of those wires to the alternator case. We'll go from there. Actually, the first thing you should do the next time the problem starts is to wiggle that "T" connector around on the back of the alternator and see if wiggling does anything. Then take the two voltage readings of the two W/R to case. I completely forgot to update you on this, sorry about that. Wiggling it worked and I haven't had an issue since. What a waste of time changing all those alternators out ended up being lol. Thanks Captain Link to comment https://www.classiczcars.com/topic/68393-alternator-overcharging/?page=5#findComment-658122 Share on other sites More sharing options...
Yarb Posted October 15, 2023 Share #55 Posted October 15, 2023 Have you located the bad connection? Link to comment https://www.classiczcars.com/topic/68393-alternator-overcharging/?page=5#findComment-658125 Share on other sites More sharing options...
chaseincats Posted October 15, 2023 Author Share #56 Posted October 15, 2023 2 hours ago, Yarb said: Have you located the bad connection? Yeah, the PO made a poor connection that was hiding under a bunch of electrical tape Link to comment https://www.classiczcars.com/topic/68393-alternator-overcharging/?page=5#findComment-658129 Share on other sites More sharing options...
Captain Obvious Posted October 16, 2023 Share #57 Posted October 16, 2023 So there was an intermittent connection in the "T" connection at the back of the alternator? You fixed that and you're charging system is all good now? Excellent!! Link to comment https://www.classiczcars.com/topic/68393-alternator-overcharging/?page=5#findComment-658151 Share on other sites More sharing options...
chaseincats Posted October 16, 2023 Author Share #58 Posted October 16, 2023 1 hour ago, Captain Obvious said: So there was an intermittent connection in the "T" connection at the back of the alternator? You fixed that and you're charging system is all good now? Excellent!! Yep! Link to comment https://www.classiczcars.com/topic/68393-alternator-overcharging/?page=5#findComment-658153 Share on other sites More sharing options...
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