MGB & GT Forum

1980 MGB Instrument Voltage Stabilizer/Regulator Picture request

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tucson, USA   USA
Hello all, I have finally gotten my 1980 MGB running and the temperature gauge and fuel gauge does not work. After a little research, it seems that the instrument panel voltage regulator/stabilizer is the culprit. I found an old one in a bag of parts, as I bought this car as a basket case, with parts everywhere! I can't seem to find anyplace behind the dash, as some of the posts have described.

Does anyone have a picture of this Regulator/Stabilizer IN PLACE, that they could share? I know what it looks like, but since mine has been unplugged, I need to know where and what color the wires are. I do have the schematic/wiring diagram and it doesn't seem to be on it!! Thanks in advance!

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29desoto Avatar
29desoto Gold Member Wayne Sanders
Outside Otis, OR - in the woods!, USA   USA
1953 MG TD
1965 MG MGB V6 Conversion "Carmine"
1968 MG MGB GT "New Yeller"
1977 MG MGB "Ole Yeller" ~ For Sale ! ~    & more
Art, it's a hard picture to take. THe little bugger goes way up under the drivers side. Location don't matter a whole lot, as long as the wires will reach. Make sure it is well grounded, and just put a screw in holding it.

But chances are the critter should be replaced. They got really flakey as they got old.

New solid state units for under $20.

Wayne Sanders
Rose Lodge, OR
(TD 4288)

"I don't care to belong to any club that accepts people like me"-joined Willamette Valley Club in 2011

77 MGB - Four tone paint -Pertronix - hood props - cheap tires - new springs all around - mixture of poly and rubber bushings- fuzzy seatcovers - stereo out of old F150 pickup -runs flawlessly and drives nice.

78 MGB - Done right by a good PO, and I only bought it. Tell Jim how nice it is. But I did put in a Datsun 5 speed.

53 TD Mark II - a work in progress.

79/65 MGB - Carmine- V-6 - T-5
This car is now very nearly completely done. Sure to find something else, but not now.........

Jim Gevay Avatar
Circle Pines, MN, USA   USA
1974 MG MGB
The stabilizer is up and behind the left side of the steering column. I'm not sure if the wires are both green or one is green/white.
This is on a '74, yours may be different.

Early 1974 MGB with OD, SU HIF's, 72 spoke chrome WW's, Schlemmer distributor, DuBois fuel pump, Limey's relays, Gerry's column kit.

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tucson, USA   USA
Thanks much for the replies, and the picture is EXACTLY what I needed!!! I know mine is shot as it was in two pieces! I also know how to make a solid state unit. It's actually quite simple, now to find those pesky wires!

Two Bs Avatar
Two Bs Gold Member Kent McNeill
London, ON, Canada   CAN
One more picture by Bruiserman shows the Voltage stabilizer (circle on the right) with a green wire and a light green/green wire. Also shown is the Inertia switch (circle on the left) to cut off the power to the fuel pump should you have crash. The button on the top of this switch needs to be pushed down to let power go to the pump. In a crash it pops up and cuts off the power.


voltage regulator and inertia cutout sw by bruiserman.jpg    63.2 KB
voltage regulator and inertia cutout sw by bruiserman.jpg

blakeaasgaard Avatar
blakeaasgaard Blake Aasgaard
Marietta, GA, USA   USA
1973 MG MGB
THANK YOU FOR THE PERFECT PICTURE!!!!! I couldn't remember where I saw it and none of my multiple shop manuals simply SHOWED WHERE IT WAS!! THANK YOU !!!!!

Pelicanpirate Avatar
Pelicanpirate Jeremy Parrett
Vero Beach, FL, USA   USA
1968 Mini 1275GT "OLD YELLA"
1979 MG MGB MkIV "Sarah"
2010 Toyota FJ Cruiser "TANK"
Does the screw securing the stabilizer act as the ground?

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barry s Avatar
barry s Silver Member Barry Stoll
Alexandria, VA, USA   USA
1972 MG MGB GT
1974 MG MGB
1976 Triumph TR6
1980 MG MGB

Pelicanpirate Avatar
Pelicanpirate Jeremy Parrett
Vero Beach, FL, USA   USA
1968 Mini 1275GT "OLD YELLA"
1979 MG MGB MkIV "Sarah"
2010 Toyota FJ Cruiser "TANK"
Thanks Barry

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MGB567 Avatar
MGB567 Gold Member Barrie Braxton
Sunshine Coast, Queensland, Australia   AUS
1966 MG MGB MkI "Money Guzzler"
1979 MG MGB GT V8 Conversion "Darkside"
"Does the screw securing the stabilizer act as the ground?"

If you are using the oem stabiliser then Barry's answer is correct (and you can relocate the stabiliser off the firewall quite easily). I'm not so sure that the answer is as categorical with the replacements which are polarity sensitive - maybe Barry can clarify.

Convertible: CKD 11/66 first registered 8/5/67. Owned since 3/77. 90% original sheet metal. 18GB +40 balanced with almost all new internals. Peter Burgess big valve fast road head. Piper 285. Fidanza FW. Basil's followers and pushrods. TR7clutch. TT exhaust. ARP everywhere. 123 ign. Needham 4synchro c/r box.. Stock rebuilt/replaced suspension. Superpro bushes. New brakes all round including all pipes in SS flex. Interior redone. CAMS approved roll bar and side bars. Lots more. Hybrid of o/e and show/fast road car. Not for sale - it's my toy!

GT: UK car built/sold December '78. Stripped back to bare shell (with extensive bodywork to come). Powered by 'worked' Rover 5 litre V8 (ex TVR Chimera) with efi. T5 box. FC IFS. CCE rear attached to Salisbury axle with Quaife. And a whole lot more to yet to come. Stealth is the word.

Nicecar Avatar
Nicecar Gary (ex "Harv") G
Victoria, BC, Canada   CAN
1980 MG MGB "Red On Red On Red"
If removing, replace it a bit lower down with a new hole to make access much easier. To be certain of a good ground, polish to bare metal the area around the hole that will contact back of stabilizer.

Buy an IC unit or install IC yourself in OE.

National Semiconductor's "LM2940T-10.0" and NTE Electronics' "NTE1953" are low dropout (LDO) solid-state voltage regulators.

Cruisedon66 Avatar
Cruisedon66 Pete W
St. Louis, MO, USA   USA
1976 MG MGB
Check the "NEW" one before installation with an Ohm meter. I've gotten ones from Moss & Victoria British that the case was installed reverse. (The connections were marked incorrectly.)

I would also put a ground wire from the screw to a known good ground as back up.

Edited 1 time(s). Last edit at 2017-03-22 11:16 AM by Cruisedon66.

briandubuc Avatar
briandubuc Gold Member Brian M. Dubuc
Roswell, GA, USA   USA
1976 Datsun 280Z
1977 MG MGB
1977 MG MGB
What does the condensor that is mounted on the firewall to the left of the inertia switch in the photograph connect to?

ex-egll Barry Winch
Nepean, ON, Canada   CAN
1977 MG MGB "The B"
If you look at the picture carefully to will see that the black wire from the capacitor loops across to the regulator. There are 3 wires going to the regulator; there is a single spade connector for voltage in (far right in the picture) and a dual connector for voltage out. The capacitor connects to one of the voltage out spades. The regulator is, I believe mechanical using a bi metallic switch, the constant switching of the voltage creates radio interference and sparking across the switch contacts, the capacitor helps eliminate that.


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