Correct, the late overdrive only works in 4th gear (a shame, isn't it?
Earlier ones were like the Healey's). My OD, which is off a '77 or so,
doesn't have the spark advance thingie either, so I can't tell you
anything about that.
Peter Schauss had this to say:
>Going over the overdrive which I bought this week
>(thanks to Dave Deutsch ) I have some questions about
>the wiring and operation. There are two switches on
>the box. Checking them with a continuity tester
>I figured out that the one on the right side is for the
>reverse lights and the one on the left is for the
>overdrive. My shop manual makes reference to a third
>switch for transmission controlled spark advance. Is
>there supposed to be such a switch?
>
>The switch which appears to be for the overdrive cutout
>is on only in 4th gear. Is that correct? (My Healey does
>overdrive in both 3rd and 4th, very convenient when the
>traffic on the parkway gets a little thick.)
>
>Thanks,
>
>Peter Schauss
>Long Island, NY
>1963 BJ7
>1980 MGB
>
>BTW, Thanks to everyone who responded with overdrives
>for sale or suggestions as to where I might buy one.
>
>
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.
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