The Forward Look Network
The Forward Look Network
Search | Statistics | User Listing Forums | Chat | eBay | Calendars | Albums | Skins | Language
You are logged in as a guest. ( logon | register )

Leaking (!!) Voltage Regulator
Jump to page : 1
Now viewing page 1 [50 messages per page]
View previous thread :: View next thread
   Forward Look Technical Discussions -> Electrical, Battery and ChargingMessage format
 
NewportBob
Posted 2019-05-21 4:47 PM (#582382)
Subject: Leaking (!!) Voltage Regulator



Regular

Posts: 96
252525
Location: Sioux Center, IA
When I rebuilt my '61 Newport, I put in a new alternator (NAPA part 231-2012, a part with lots of Mopar applications) and upgraded to an electronic voltage regulator (NAPA VR38SB), which entailed a bit of re-wiring. All was well for 3 years or so. Last August, I noticed goo on the inner fender--the regulator was leaking. Its insulation or matrix (whatever it's called) seems to have begun to melt. The regulator was working. I replaced it, but the new one is beginning to do the same thing. What's up?

I tested the voltage at the battery--12.3 v when not running. Starting it up, the voltage went up to 15v; revving the engine backed it off to 14.6 or so. Is the alternator overcharging?

Other relevant info? I use a charger/maintainer when the car is not in use, but I have an isolation switch that cuts power from the battery to everything.

One regulator is a bad one; two in a row means another problem?

Thanks in advance for any advice on this great forum!

Bob
Top of the page Bottom of the page
wizard
Posted 2019-05-22 1:06 AM (#582402 - in reply to #582382)
Subject: Re: Leaking (!!) Voltage Regulator



Board Moderator & Exner Expert 10K+

Posts: 11923
500050001000500100100100100
Location: Southern Sweden - Sturkö island
actually, you downgraded to a yellow electronic voltage regulator.
I helped a guy with a 300G who changed 3 of those in one day. I had an old voltage regulator, mounted it and it's still working after 3 years.
Top of the page Bottom of the page
Old Ray
Posted 2019-05-22 10:17 AM (#582405 - in reply to #582382)
Subject: RE: Leaking (!!) Voltage Regulator



Extreme Veteran

Posts: 354
1001001002525
Location: Invermere B.C. Canada - Rocky Mountains
I tested the voltage at the battery--12.3 v when not running. Starting it up, the voltage went up to 15v; revving the engine backed it off to 14.6 or so. Is the alternator overcharging? Bob

At risk of being wrong, ....... I think that is perfect.
Top of the page Bottom of the page
57chizler
Posted 2019-05-22 1:34 PM (#582411 - in reply to #582405)
Subject: RE: Leaking (!!) Voltage Regulator



Expert

Posts: 3179
20001000100252525
Location: NorCal
I agree, 14.6V is perfect.

The newer style solid-state regulators are well known to ooze the potting compound, doesn't hurt the function but makes a mess and probably shortens the life. Instead of mounting the regulator directly to the firewall, some models used a bracket that allows air to circulate under it.

Edited by 57chizler 2019-05-22 2:00 PM




(VR Bracket.jpg)



Attachments
----------------
Attachments VR Bracket.jpg (57KB - 9 downloads)
Top of the page Bottom of the page
normsclassicradio
Posted 2019-05-22 5:02 PM (#582420 - in reply to #582382)
Subject: Re: Leaking (!!) Voltage Regulator



Veteran

Posts: 137
10025
Location: Kalispell, MT USA
Maybe adding a heat sink to the front of the unit would make it run cooler. Some heat sink compound and a metal strap of some kind?
I wonder if an old computer CPU heat sink would be about the right size...

Edited by normsclassicradio 2019-05-22 5:04 PM




(heat sink.jpg)



Attachments
----------------
Attachments heat sink.jpg (74KB - 8 downloads)
Top of the page Bottom of the page
NewportBob
Posted 2019-05-22 5:22 PM (#582426 - in reply to #582382)
Subject: Re: Leaking (!!) Voltage Regulator



Regular

Posts: 96
252525
Location: Sioux Center, IA
These are very helpful comments! I am happy to learn that 1) the substance is called "potting material"; 2) its ooze is not a sign of imminent failure and is common; 3) my alternator is within range; 4) that newer is not always better.

I like the idea of a bracket or heat sink to manage the problem; digging out the old regulator is my fallback plan. Happy for more ideas or experiences if you they are out there. I will report back when I have made any changes.
Top of the page Bottom of the page
Jump to page : 1
Now viewing page 1 [50 messages per page]
Jump to forum :
Search this forum
Printer friendly version
E-mail a link to this thread



(Delete all cookies set by this site)