Previous Thread
Next Thread
Print Thread
Leaky Voltage Regulator #3177320
09/22/23 09:05 PM
09/22/23 09:05 PM
Joined: May 2021
Posts: 35
Sunshine State
C
Crosshairs Offline OP
member
Crosshairs  Offline OP
member
C

Joined: May 2021
Posts: 35
Sunshine State
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?

Re: Leaky Voltage Regulator [Re: Crosshairs] #3177322
09/22/23 09:19 PM
09/22/23 09:19 PM
Joined: Jan 2003
Posts: 13,718
md
M
mopars4ever Offline
I Live Here
mopars4ever  Offline
I Live Here
M

Joined: Jan 2003
Posts: 13,718
md
Not uncommon. Some can be a sticky mess.

Re: Leaky Voltage Regulator [Re: mopars4ever] #3177409
09/23/23 10:26 AM
09/23/23 10:26 AM
Joined: Sep 2003
Posts: 20,453
north of coder
moparx Offline
"Butt Crack Bob"
moparx  Offline
"Butt Crack Bob"

Joined: Sep 2003
Posts: 20,453
north of coder
is there an epoxy that can be added over the potting material that could possibly stop that from happening ?
beer

Re: Leaky Voltage Regulator [Re: moparx] #3177417
09/23/23 10:53 AM
09/23/23 10:53 AM
Joined: Jun 2014
Posts: 1,390
VA
D
dragon slayer Offline
pro stock
dragon slayer  Offline
pro stock
D

Joined: Jun 2014
Posts: 1,390
VA
It is going to ruin your paint if you don't change it. There are potting compounds, not sure if you need to remove the old though. It is a pain digging it out.

Re: Leaky Voltage Regulator [Re: Crosshairs] #3177454
09/23/23 12:42 PM
09/23/23 12:42 PM
Joined: Aug 2011
Posts: 2,913
Pattison Texas
CSK Offline
master
CSK  Offline
master

Joined: Aug 2011
Posts: 2,913
Pattison Texas
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

Re: Leaky Voltage Regulator [Re: CSK] #3177539
09/23/23 04:46 PM
09/23/23 04:46 PM
Joined: Jan 2003
Posts: 13,718
md
M
mopars4ever Offline
I Live Here
mopars4ever  Offline
I Live Here
M

Joined: Jan 2003
Posts: 13,718
md
Seen both do it. More so on the ecu though

Re: Leaky Voltage Regulator [Re: CSK] #3178075
09/25/23 12:10 PM
09/25/23 12:10 PM
Joined: May 2021
Posts: 35
Sunshine State
C
Crosshairs Offline OP
member
Crosshairs  Offline OP
member
C

Joined: May 2021
Posts: 35
Sunshine State
VR!

Re: Leaky Voltage Regulator [Re: Crosshairs] #3178240
09/25/23 09:44 PM
09/25/23 09:44 PM
Joined: Jan 2003
Posts: 15,964
Omaha Ne
T
TJP Offline
I Live Here
TJP  Offline
I Live Here
T

Joined: Jan 2003
Posts: 15,964
Omaha Ne
Originally Posted by Crosshairs
VR!


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? beer

Re: Leaky Voltage Regulator [Re: Crosshairs] #3178257
09/26/23 01:10 AM
09/26/23 01:10 AM
Joined: Aug 2003
Posts: 43,855
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 43,855
Bend,OR USA
sounds like bad grounding on that regulator scope wrench up twocents


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Leaky Voltage Regulator [Re: Cab_Burge] #3178264
09/26/23 06:41 AM
09/26/23 06:41 AM
Joined: Jun 2014
Posts: 1,390
VA
D
dragon slayer Offline
pro stock
dragon slayer  Offline
pro stock
D

Joined: Jun 2014
Posts: 1,390
VA
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.

Re: Leaky Voltage Regulator [Re: dragon slayer] #3178289
09/26/23 09:12 AM
09/26/23 09:12 AM
Joined: Jan 2003
Posts: 13,718
md
M
mopars4ever Offline
I Live Here
mopars4ever  Offline
I Live Here
M

Joined: Jan 2003
Posts: 13,718
md
Originally Posted by dragon slayer
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.

Re: Leaky Voltage Regulator [Re: mopars4ever] #3178291
09/26/23 09:26 AM
09/26/23 09:26 AM
Joined: May 2005
Posts: 4,919
Florida
BDW Offline
master
BDW  Offline
master

Joined: May 2005
Posts: 4,919
Florida
I put on a new resto VR, small leak down firewall initially, cleaned that off, and it never did it again.
It was weird, like it had to cure the goop.

Re: Leaky Voltage Regulator [Re: Crosshairs] #3178334
09/26/23 11:05 AM
09/26/23 11:05 AM
Joined: Jan 2003
Posts: 75,318
A gulag near you.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 75,318
A gulag near you.
Originally Posted by Crosshairs
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 ???


Mainstream Media is the new Pravda
Re: Leaky Voltage Regulator [Re: mopars4ever] #3178536
09/27/23 06:00 AM
09/27/23 06:00 AM
Joined: Jun 2014
Posts: 1,390
VA
D
dragon slayer Offline
pro stock
dragon slayer  Offline
pro stock
D

Joined: Jun 2014
Posts: 1,390
VA
Originally Posted by mopars4ever
Originally Posted by dragon slayer
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.

Re: Leaky Voltage Regulator [Re: Crosshairs] #3178960
09/28/23 11:35 AM
09/28/23 11:35 AM
Joined: Oct 2007
Posts: 743
New York
R/T1968R/T Offline
super stock
R/T1968R/T  Offline
super stock

Joined: Oct 2007
Posts: 743
New York
Flex Seal
https://board.moparts.org/ubbthreads/ubbthreads.php/ubb/showflat/Number/3123397/Searchpage/1/Main/255481/Words/%2Bflex+%2Bseal/Search/true/re-ignition-box-voltage-regulator-potting-material.html#Post3123397
https://www.forbbodiesonly.com/moparforum/threads/sticky-goo-coming-out-of-orange-box.198163/page-2

Last edited by R/T1968R/T; 09/28/23 11:47 AM.
Re: Leaky Voltage Regulator [Re: dragon slayer] #3178964
09/28/23 11:44 AM
09/28/23 11:44 AM
Joined: Jan 2003
Posts: 13,718
md
M
mopars4ever Offline
I Live Here
mopars4ever  Offline
I Live Here
M

Joined: Jan 2003
Posts: 13,718
md
Originally Posted by dragon slayer
Originally Posted by mopars4ever
Originally Posted by dragon slayer
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.







Powered by UBB.threads™ PHP Forum Software 7.7.1