It's *near* the top of the gearbox, but on the right-hand side (as you face
forwards). It sticks out upwards and sideways so is *relatively* easy
(compared to the OD switch) to get a pair of channel-lock pliers on it from
underneath. Lowering the rear of the gearbox and its crossmember on a jack
makes it quite a bit easier. See the bottom image here
http://www.mgb-stuff.org.uk/lights4.htm#2 This is a rubber bumper gearbox
but the switches are in the same location on all 4-synch gearboxes.
Why are you planning on replacing it? Not knowing where the switch is you
obviously haven't been able to prove the problem isn't caused by a loose
connection, which is much more likely. The switch could also be loose and
just need tightening. They were also usually fitted with two fibre spacer
washers, if the operating lever and button has worn removing one of these is
usually all that is required. But given the use that reverse gets wear, and
failure, of the reverse light switch is very rare indeed. The OD switch
(which is the same *type* of switch, not the same switch but on the other
side facing rearwards) gets much more use and even that only rarely fails or
needs adjustment.
PaulH.
----- Original Message -----
> I am trying to locate the backup light switch on my "72 MGB so as to
> replace it. I need it for inspection purposes, otherwise it never gets
> used. Thanks in advance for any input.
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