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MG MGB Technical - Heater wiring

Now have the heater box out of the 1977 B roadster (see previous thread) but have a loose wire in the heater box itself. Any body know where this goes to I couldnt find any detail in th wiring diagram that i have. I thought the fan was working when i last used the heater but that's a while back and not sure if it was running at both speeds.

Picture attached for info.
Andy

A Charman

Andy
Thats not how they are meant to be and has been altered by someone as the 2 wires go direct into the motor as standard

Ste
Ste Brown

The resistor is there to provide multiple speeds for the fan motor. I don't know if the 77 MGB came this way from the factory or if this is a PO modification. Cheers - Dave
David DuBois

Hi Andy,

As David said.

Check out this part of Paul Hunt's site

http://www.mgb-stuff.org.uk/heater2.htm

for internal wiring.

Herb
Herb Adler

Thanks Herb, looks like the 3 wires are correct and one has come adrift from the resistor, probably when i was removing it from the car.
A Charman

Correct indeed, and factory for 77 and later models. I'd like to use that photo on my site if I may, attributed of course.
PaulH Solihull

The wiring diagram was usefull, the MGOC said they had no wiring diagram!
A Charman

This thread was discussed between 18/01/2011 and 20/01/2011

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