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Help! - Overdrive Problems

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  • Help! - Overdrive Problems

    Hi, first post and it's a technical one!

    I have a KZN130 (1994) and am having a few problems with overdrive and speedo.
    My problems only seem to occur when it rains, so must be water ingress somewhere. Is there a common water problem with the Surf, if not can someone point me to a wiring diagram??
    The problem is that when it rains, overdrive fails to operate. The light on the dash still functions with the switch on the gearstick but the car doesn't drop into overdrive. Also, the gear change isn't at the same point in the rev range, it seems to hold onto the gear for longer than when o/d is working (if that makes sense!)

    All help appreciated!