Wiring loom location on 66 Roadster : MGB & GT Forum : The MG Experience

Wiring loom location on 66 Roadster #1
Alexj Alex Jeffery Sheffield, South Yorkshire, UK Sign in to contact 1967 MG MGB	Topic Creator (OP) Jul 17, 2009 07:14 AM Joined 18 years ago 18 Posts

I am restoring a '66 MGB Roadster. Does anybody know the correct routing of the wiring loom as it passes the voltage regulator?
My roadster has been in the family almost all its life and I am 99.9% sure that the wiring is just as it came from the factory. My loom is BELOW the voltage regulator, however I have seen many images of MK1 MGB's that have the wiring loom routed BEHIND the regulator mounting plate.
It would be nice to know how the factory routed the loom. Thanks in advance, Alex.

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Re: Wiring loom location on 66 Roadster #2
sunny124ny Sunny Sunny Sonnenrein Riegelsville, PA, USA Sign in to contact 1963 MG MGB "Monty"	Jul 17, 2009 07:23 AM Joined 18 years ago 1,805 Posts

Hi Alex,
wow...working on a family heirloom! Below is a pic of the voltage regulator area in my 63B - hope this helps...

VoltageRegulator.JPG 45.7 KB

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Re: Wiring loom location on 66 Roadster #3
sunny124ny Sunny Sunny Sonnenrein Riegelsville, PA, USA Sign in to contact 1963 MG MGB "Monty"	Jul 17, 2009 07:25 AM Joined 18 years ago 1,805 Posts

...one more as overview...

Engine compartment .jpg 44.4 KB

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Re: Wiring loom location on 66 Roadster #4
Alexj Alex Jeffery Sheffield, South Yorkshire, UK Sign in to contact 1967 MG MGB	Topic Creator (OP) Jul 17, 2009 07:32 AM Joined 18 years ago 18 Posts

I can see that the loom on your MGB goes behind the regulator plate. Here's a picture of mine...

loom1.jpg 58.6 KB

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Re: Wiring loom location on 66 Roadster #5
MGB65B Thomas Aczel Sydney, Kurrajong Hts, Australia Sign in to contact 1962 MG MGA MkII 1965 MG MGB "Dad's Little White Car"	Jul 17, 2009 07:38 AM Top Contributor Joined 19 years ago 3,304 Posts

My Australian production car's harness runs behind the regulator. I've had the car since it was four years old and I've no reason to presume the wiring was fiddled with before I bought it, and it certainly hasn't been touched since. I've been treating some rust around here, so here's a photo with the regulator folded down. (Some of the grey cloth wrapping disintegrated as I was cleaning around here.)

P5020182.JPG 43.4 KB

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Re: Wiring loom location on 66 Roadster #6
Alexj Alex Jeffery Sheffield, South Yorkshire, UK Sign in to contact 1967 MG MGB	Topic Creator (OP) Jul 17, 2009 09:10 AM Joined 18 years ago 18 Posts

Could it be that around late 66 the factory moved the loom below the reg? Here's one with the loom below:

GHN3L131923_ec_20080913_22A045L.jpg 46.4 KB

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Re: Wiring loom location on 66 Roadster #7
Alexj Alex Jeffery Sheffield, South Yorkshire, UK Sign in to contact 1967 MG MGB	Topic Creator (OP) Jul 17, 2009 09:15 AM Joined 18 years ago 18 Posts

One more...

1965%20mgb%20rdst%20eng.jpg 50.1 KB

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Re: Wiring loom location on 66 Roadster #8
jimb Jim Brown San Francisco Bay Area, USA Sign in to contact 1958 MG Magnette 1967 MG MGB	Jul 17, 2009 09:32 AM Top Contributor Joined 22 years ago 2,125 Posts

Here's a pic from my '67 (built in mid '66) showing the wiring below the regulator.

reg.gif 152.6 KB

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Re: Wiring loom location on 66 Roadster #9
Alexj Alex Jeffery Sheffield, South Yorkshire, UK Sign in to contact 1967 MG MGB	Topic Creator (OP) Jul 17, 2009 09:37 AM Joined 18 years ago 18 Posts

Now that's what I was looking for! Many thanks Jim.

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Re: Wiring loom location on 66 Roadster #10
mar3kl Mark Lambert San Francisco Bay Area, USA Sign in to contact	Jul 17, 2009 11:46 AM Joined 17 years ago 730 Posts

The mounting bracket for the regulator was changed in 1966(?) and made smaller. Older cars have the harness behind the (larger) bracket, later cars have the harness below the bracket.

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Re: Wiring loom location on 66 Roadster #11
Dan1966BRG Dan Cooley Seattle, WA, USA Sign in to contact	Jul 18, 2009 01:12 AM Joined 16 years ago 126 Posts

Here's my '66 loom location shot:

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Re: Wiring loom location on 66 Roadster #12
Alexj Alex Jeffery Sheffield, South Yorkshire, UK Sign in to contact 1967 MG MGB	Topic Creator (OP) Jul 18, 2009 07:05 AM Joined 18 years ago 18 Posts

Thanks for all your help. For my 'built' 66 car I will run the loom below the regulator. Alex

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Re: Wiring loom location on 66 Roadster #13
Lee Lee Miller Mburg, PA, USA Sign in to contact 1966 MG MGB 1967 MG MGB 1971 MG MGB 1971 MG Midget	Jul 18, 2009 07:15 AM Joined 26 years ago 4,384 Posts

Here are some closer looks at GHN3L131923

Lee Miller

Experience - hobbyist, rotisserie restoration 1967 MGB, welding, bodywork, painting, wiring, interior, suspension, clutch, engine, SU HS4 carburetors, windshield, and installing convertible top.

Website www.myclassicmg.com

1971 MG MGB
1971 MG Midget
1967 MG MGB
1966 MG MGB restoration project

Edited 1 time(s). Last edit at 2009-07-18 07:24 AM by Lee.

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Wiring loom location on 66 Roadster

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