Re: Leaky Voltage Regulator
[Re: Crosshairs]
#3177454
09/23/23 01:42 PM
09/23/23 01:42 PM
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Joined: Aug 2011
Posts: 2,859
Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,859
Pattison Texas
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Is it the voltage regulator or the ign module that is leaking, never seen a V reg leak ?, seen MANY modules get hot & leak
1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5
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Re: Leaky Voltage Regulator
[Re: Crosshairs]
#3178240
09/25/23 10:44 PM
09/25/23 10:44 PM
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Joined: Jan 2003
Posts: 15,357
Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,357
Omaha Ne
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Have you checked the alternator output and voltage at the battery? Should be within .2 - .5 V or less. How hot is the regulator getting? Is it near a heat source? 
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Re: Leaky Voltage Regulator
[Re: dragon slayer]
#3178289
09/26/23 10:12 AM
09/26/23 10:12 AM
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Joined: Jan 2003
Posts: 13,585
md
mopars4ever
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,585
md
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The voltage regulator only handles field current not output. I have seen VR potting liquify. It is from age not heat. Heck it can be 30 to 54yrs old. Not totally agreeing with the age vs heat thing. I had a couple NOS ECU`s in a hot attic and they leaked out. I had others in the garage where it was cooler and they never leaked out.
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Re: Leaky Voltage Regulator
[Re: Crosshairs]
#3178334
09/26/23 12:05 PM
09/26/23 12:05 PM
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Joined: Jan 2003
Posts: 75,005
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,005
U.S.S.A.
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69 Charger 440 with the Mopar electronic ignition conversion. This setup came with the 4 prong ballast resistor. I recently noticed that the VR is dripping down the firewall. Still runs fine, but what gives with that? sounds like you also upgraded your charging system to the 70 up ?? If not there isn't anything that would leak from a 69 down VR ???
running up my post count some more .
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Re: Leaky Voltage Regulator
[Re: mopars4ever]
#3178536
09/27/23 07:00 AM
09/27/23 07:00 AM
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Joined: Jun 2014
Posts: 1,323
VA
dragon slayer
pro stock
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pro stock
Joined: Jun 2014
Posts: 1,323
VA
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The voltage regulator only handles field current not output. I have seen VR potting liquify. It is from age not heat. Heck it can be 30 to 54yrs old. Not totally agreeing with the age vs heat thing. I had a couple NOS ECU`s in a hot attic and they leaked out. I had others in the garage where it was cooler and they never leaked out. How hot does your attic get? Certainly high heat can lead to premature break down of the potting. But I have seen plenty of ECU leak out stored in cool cabinets. So to imply as long as they don't get hot they will last is wrong. In his case we are taking about electronic VR which only handles about 2.5amp of field current. Also the notion that loss of a ground cause this is not correct either. Losing VR ground means NO field current, and low no alternator output. If it truly was "just" heat you would see a potting leak or hole in the vicinity of the power transistor that generates the heat. Yet plenty of ECU and VR to a lesser extent have all the potting go soft.
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Re: Leaky Voltage Regulator
[Re: dragon slayer]
#3178964
09/28/23 12:44 PM
09/28/23 12:44 PM
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Joined: Jan 2003
Posts: 13,585
md
mopars4ever
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,585
md
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The voltage regulator only handles field current not output. I have seen VR potting liquify. It is from age not heat. Heck it can be 30 to 54yrs old. Not totally agreeing with the age vs heat thing. I had a couple NOS ECU`s in a hot attic and they leaked out. I had others in the garage where it was cooler and they never leaked out. How hot does your attic get? Certainly high heat can lead to premature break down of the potting. But I have seen plenty of ECU leak out stored in cool cabinets. So to imply as long as they don't get hot they will last is wrong. In his case we are taking about electronic VR which only handles about 2.5amp of field current. Also the notion that loss of a ground cause this is not correct either. Losing VR ground means NO field current, and low no alternator output. If it truly was "just" heat you would see a potting leak or hole in the vicinity of the power transistor that generates the heat. Yet plenty of ECU and VR to a lesser extent have all the potting go soft. Just saying the NOS ones I had in my attic where it gets very hot at times that they both got soft and sticky. I had them for just a few years and they were all fine when I bought them. They were 40 plus year old NOS. So you tell me what happened? The other two are fine.
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