Volvo RWD 120-130 Forum

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Overdrive Conversion 120-130

posted by  someone claiming to be Chris Noyes on  Wed Apr 9 03:45 CST 2003 [RELATED]

Greetings

I am in the process of installing an overdrive from a 72 142 into my 68 122. The doner trans unit has a silver rectangular box with a spade type electrical connector on the rear of the trans just behind and below the shifterassy/cover. It is not the backup light switch, or lock out switch, or overdrive solenoid. What else is ther?


Thanks
Chris








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Overdrive Conversion 120-130 1968

posted by  walrus3 on  Wed Apr 9 03:48 CST 2003
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last visit: Mon Dec 2 14:20 CST 2013
[RELATED]

It is the backup light switch. If you check with a meter or continuity
tester you'll find that it goes to ground when the tranny is in reverse
(when the reverse shifter shaft comes back and touches the contact inside).
The relay coil is hot and the ground wire goes to that switch.
Sort of like a dome light switch.
--
George Downs, The "original" Walrus3, Bartlesville, Oklahoma








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Overdrive Conversion 120-130 1968

posted by  someone claiming to be Chris Noyes on  Wed Apr 9 07:56 CST 2003 [RELATED]

ok
Then what are the two switches on the cover?








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Overdrive Conversion 120-130 1968

uid 4846's pic
posted by  JohnMc on  Wed Apr 9 08:29 CST 2003
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last visit: Thu Oct 23 07:42 CST 2014
[RELATED]

Depending on the age of the tranny, one could be a 'nutral' switch - which I think has something to do with the seatbelt warning buzzers. The other is the 4th gear switch, which you must use in wiring up the OD.







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