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240 dimmer pot wiring?

posted by  Cubnuts on  Tue Jan 2 06:41 CST 2018
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Have an '85 245GL non-turbo and the wipers got in a fight on the windshield so, took out the dash and repaired/serviced the system. Good news is that the wipers are working in harmony now!

Bad news is that, when I reassembled the dash, can't get the dimmer pot to work? In addition, when I turn on the lights, the tach and clock quit working? Mysterious ... but, have a "stock pot for it", not the one I took out and, there are 2 lugs on the back of it but only 1 wire from the loom to connect it to? Both wires are positive and connect to each other thru a "double lug"?

Seems to me that my problem is that I can't find the 2nd wire off the loom to connect to the back of the pot? (In reading about rheostats/potentiometers and the like, there are 2 kinds, one has 3 poles, negative, positive and output, the other has 2 poles, input and output and as the resistance varies the appliance it operates varies?) Would seem that I need a 2nd pole no matter which style my car is designed for?

Thanks for your help with this!

Jim








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    240 dimmer pot wiring? 200 1985

    uid 27's pic
    posted by  Art Benstein on  Tue Jan 2 06:57 CST 2018
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    last visit: Fri Oct 17 20:10 CST 2014
    [RELATED]

    Check to see both sides of your tail lights are working. (fuses 16 for the right side)

    Would a wiring diagram help you?

    http://volvowiringdiagrams.com

    Look in TP30808. Dimmer pot is a two-terminal device, but one of its terminals may have two lugs like in this example.



    Usually when the clock and tach suddenly need the lights to be off in order to find a ground, a small trace on the instrument cluster circuit board has burned. This happens when the battery is left connected while working behind the dash and the accessory external clock wiring (always hot) gets bumped against ground by accident.

    http://volvowiringdiagrams.com/volvo/240%20Wiring%20Diagrams/TP30808-1%201985%20240%20260%20Wiring%20Diagrams.pdf
    --
    Art Benstein near Baltimore

    Notes on 240 Volvo Windscreen Wipers







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