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Voltage regulator smoking
#2391671
10/23/17 10:46 AM
10/23/17 10:46 AM
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69cornetr/t
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69cornetr/t
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I got a 68 Barracuda the voltage regulator smokes after about a minute of running. Ive change the alternator voltage regulator starter relay clean the bulkhead connections bypass the ballast resistor how can I troubleshoot this problem I've checked continuity to ground everything seems to check out. I'm running a pertronix 3 distributor
Last edited by 69cornetr/t; 10/23/17 01:51 PM.
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Re: Voltage regulator smoking Vo
[Re: ]
#2391715
10/23/17 11:51 AM
10/23/17 11:51 AM
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Joined: Jan 2003
Posts: 10,737 North Dakota
6PakBee
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Assuming you are still using the stock mechanical regulator, if you look at the back you'll see two resistors. The smoke you see is probably from one of them being overheated. Try starting the car with the field lead to the alternator disconnected. Still smoke, PROBABLY the regulator. No smoke, PROBABLY the alternator. I'd still have both checked before I started replacing parts willy nilly.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Voltage regulator smoking Vo
[Re: ]
#2391729
10/23/17 12:23 PM
10/23/17 12:23 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Lincoln Nebraska
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You changed the reg & the new one is smokeing like the old one did?
live every 24 hour block of time like it's your last day on earth
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Re: Voltage regulator smoking Vo
[Re: 6PakBee]
#2391767
10/23/17 01:22 PM
10/23/17 01:22 PM
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69cornetr/t
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69cornetr/t
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Won't smoke with the field disconnected I've already changed the alternator and voltage regulator. The first vr the red wire before it gets to where it's wrapped was getting hot looks like the replacement is doing the same
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Re: Voltage regulator smoking Vo
[Re: RapidRobert]
#2391768
10/23/17 01:22 PM
10/23/17 01:22 PM
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69cornetr/t
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69cornetr/t
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Re: Voltage regulator smoking Vo
[Re: ]
#2391818
10/23/17 02:52 PM
10/23/17 02:52 PM
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Joined: Jan 2003
Posts: 10,737 North Dakota
6PakBee
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Okay, are you using the stock mechanical regulator or the aftermarket solid state unit? Within the first minute before you get the smoking, what is your ammeter reading?
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Voltage regulator smoking Vo
[Re: 6PakBee]
#2391845
10/23/17 03:16 PM
10/23/17 03:16 PM
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69cornetr/t
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69cornetr/t
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Stock mechanical and im not 100% sure but the ammeter gauge was charging
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Re: Voltage regulator smoking Vo
[Re: ]
#2391865
10/23/17 03:39 PM
10/23/17 03:39 PM
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Joined: Jan 2003
Posts: 10,737 North Dakota
6PakBee
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I Live Here
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I'm a little confused when you mention the red voltage regulator wire. The standard voltage regulator color codes for that era were green for the field lead and dark blue for the ignition lead. Has your car been re-wired?
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Voltage regulator smoking Vo
[Re: ]
#2391881
10/23/17 04:05 PM
10/23/17 04:05 PM
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69cornetr/t
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69cornetr/t
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Sorry i didn't clarify myself. I took the cover off the voltage regulator and the thin red wire under that is what got hot. Then it's winds around Inside the vr
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Re: Voltage regulator smoking Vo
[Re: ]
#2391983
10/23/17 07:05 PM
10/23/17 07:05 PM
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69cornetr/t
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69cornetr/t
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yeah that's what it sounds like but I got a different alternator and it's still doing it and I check for continuity on the field wire and it's not going to ground
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Re: Voltage regulator smoking Vo
[Re: ]
#2392018
10/23/17 08:33 PM
10/23/17 08:33 PM
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Joined: Jan 2003
Posts: 25,899 Rio Linda, CA
John_Kunkel
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Have you checked the field wire where it runs along the valve cover for a short to ground?
The INTERNET, the MISinformation superhighway
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Re: Voltage regulator smoking Vo
[Re: John_Kunkel]
#2392079
10/23/17 10:51 PM
10/23/17 10:51 PM
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Joined: Jan 2003
Posts: 10,737 North Dakota
6PakBee
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I Live Here
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That's why I asked what your ammeter read. All the symptoms point to excessive field current. If the voltage regulator is good AND grounded AND the alternator is known to be good, then it sounds like the alternator is running close to being full fielded. I'm thinking that this could be due to a huge system electrical load OR the sense voltage at the regulator is low for some reason. What is the voltage reading at the IGN terminal with the engine running? Should be pretty close to battery voltage.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Voltage regulator smoking Vo
[Re: 6PakBee]
#2392157
10/24/17 02:03 AM
10/24/17 02:03 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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We're missing some info here. if the reg/alt are good/grounded, green reg to alt wire ain't grounded, batt is charged up then it must charge normal. I would check that green wire like John said then ohm/check the alt field circuit/terminals even tho they said it was fine.
live every 24 hour block of time like it's your last day on earth
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Re: Voltage regulator smoking Vo
[Re: 6PakBee]
#2392237
10/24/17 10:57 AM
10/24/17 10:57 AM
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69cornetr/t
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69cornetr/t
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I'll check the reading on green field wire at the vr again but I'm pretty sure it was very low
Last edited by 69cornetr/t; 10/24/17 10:59 AM.
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Re: Voltage regulator smoking Vo
[Re: dogdays]
#2392244
10/24/17 11:17 AM
10/24/17 11:17 AM
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69cornetr/t
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69cornetr/t
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You would sure think the field wire was shorting out but my meter says it wasnt
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Re: Voltage regulator smoking
[Re: ]
#2392257
10/24/17 11:52 AM
10/24/17 11:52 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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I got a 68 Barracuda the voltage regulator smokes after about a minute of running. I'm thinking the "points" on the new reg are sticking or it is misadjusted (I'm assuming this is an electromechanical reg with the 2 wire wound resistors like in the above pic). I would get a replacement "electronic" reg at your parts house. Though you might do a good visual on the green field wire for any potential bare wire dead short & pay extra attention to the terminal at the alt. If any doubt regarding it I would take off the green field wire & with a jumper wire with alligator clips, jump from the reg to the alt field.
live every 24 hour block of time like it's your last day on earth
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Re: Voltage regulator smoking
[Re: ]
#2392263
10/24/17 11:58 AM
10/24/17 11:58 AM
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69cornetr/t
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69cornetr/t
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Yep I was just thinking that myself
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Re: Voltage regulator smoking
[Re: ]
#2392265
10/24/17 12:00 PM
10/24/17 12:00 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Yes, the fact that it takes a minute for it to act up is what Sherlock Holmes would call a (serious) clue. (I missed it initially).
live every 24 hour block of time like it's your last day on earth
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