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LITTLE GREEN WIRE

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LITTLE GREEN WIRE
#1
  This topic is about my 1979 MG MGB MkIV
peter8004 Avatar
peter8004 Peter Dhama
Thornhill, Ontario, Canada   CAN
1973 MG MGB "4th Time"
1973 MG MGB
1979 MG MGB MkIV
Gents, i just picked up this LE... Gorgeous all original 79. Number 244 of 250. Anyway, I had one of these brand new and sold it years ago. Since, I have had my 73 which I sold after 20 odd years. Now the question. I dont ever recall a wire like this on my previous car. It attached to the back of the carb... any thoughts.

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mowog1 Avatar
mowog1 Gold Member Rick Ingram
Saint Joseph, Illinois, USA   USA
1969 MG MGC "Vicky"
1972 MG MGB "Mallard"
1974 MG MGB GT V8 Conversion "The V8"
1978 MG MGB "Maggie"    & more
Induction heater wire.



1969 MGC - 1972 MGB - 1974&1/2 MGB/GT V8 conversion - 1978 MGB

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mgbmac Avatar
mgbmac Silver Member James Patrick
Darien, CT, USA   USA
1980 MG MGB
Peter,
That green wire attaches to a square block heater that is supposed to work in cold weather. I believe John Twist has a video regarding it's use and usefulness. It tends to crack and can be a source of vacuum leaks. I replaced mine with a solid piece from VB. Have fun, Jim

peter8004 Avatar
peter8004 Peter Dhama
Thornhill, Ontario, Canada   CAN
1973 MG MGB "4th Time"
1973 MG MGB
1979 MG MGB MkIV
i followed the wire to a box just under the fuse box... looks like a relay of some kind with two prongs. one of which the green wire is attached to.

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rocannon Avatar
rocannon Platinum Member Frank L
Inconveniently located in the wilderness, Oklahoma, USA   USA
1967 MG MGB GT "GT From Hell"
1980 MG MGB "Restored By Photoshop Inc."
You have some tracing to do. See attached.

In reply to # 3626716 by peter8004 i followed the wire to a box just under the fuse box... looks like a relay of some kind with two prongs. one of which the green wire is attached to.






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course2kid Jeffrey Johnson
Fountain Valley, CA, USA   USA
1979 MG MGB "Lucy (Lucifer)"
As others noted, it goes to the induction heater. The cylindrical part with a domed end is a thermal switch that closes below a certain temperature (I don't recall what temperature, but, IIRC, it's a ways below freezing. When it closes, current flows through a heater coil that warms the intake air/fuel mixture entering the intake manifold.

It sounds like the PO of your car added a relay in series with the heater.



Edited 1 time(s). Last edit at 2017-11-13 07:05 PM by course2kid.

BumbleB74 Avatar
BumbleB74 William Milholen
Tidewater, Tidewater VA, USA   USA
wow....looks like you bought a time capsule!



1974-1/2 Roadster, "Bumble Bee", Corvette Yellow - in shambles, wire wheels
1976 Roadster, "Virus", Sandglow - "driver" condition (stock + 32/36 Weber DGEV, cast iron header, 25D distributor), bolt on wheels, ON the road!

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