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  • OD inoperable...

    Just started having problems w/OD. Seemed to be working fine and now, nothing. OD relay in engine bay clicks/cycles IAW turning OD on/off, nothing else. Still no OD.
    I have another OD switch, I'll replace orig. I also have unknown relay 26RA or SRB400 or 718884, numbers on the Lucas box.
    87
    Is this an OD relay? 86 87A 85 Connections on relay
    30/51
    Any info/assist if greatly appreciated. WRT removing console, carpeting, tunnel...I'm not looking forward to it, but if I must...
    Thanks, Steve

  • #2
    Try topping up the oil level in the transmission (this also serves the overdrive unit). It may solve your problem. Try and tell if the solenoid is engaging when you turn the switch on. It's probably not the switch on the column if the relay is clicking.
    1961 TR4 1966 TR4A
    1968 TR250 1975 TR6

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    • #3
      Try running a secondary ground from the solenoid on the OD to the chasis.
      CF1634U+O Pimento/Chestnut
      2nd owner, since 1975
      Soon to be in Fair Oaks, CA

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      • #4
        Could also try and clean the internal filter(s)

        Cheers
        Tush
        81 Alfa Romeo Spider Veloce, 81 Triumph TR8
        73 Triumph TR6 CF4874UO, 68 Triumph TR250 CD5228LO
        62 Triumph TR4 CT6716LO, 60 Triumph TR3A TS69891LO
        60 Triumph TR3A TS64870LO, 59 Triumph TR3A TS44836LO

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        • #5
          If it's just quit all of a sudden check the solenoid under the car and see if you can see or hear it move while someone flips the switch. With mine, sometimes the bullets around the tunnel used to come loose before I cleaned and tightened them. If the solenoid moves then it gets more complex so report back.
          72 Pimento w/overdrive

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          • #6
            Check for proper hydraulic pressure. sometimes you can not use the OEM hole to set your lever do to old age and or wear and must go slightly past it to get proper valve alignment for the OD to engage.

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            • #7
              Thanks for the input: drained and topped off with new trans oil (brad penn 75/90), cleaned severely clogged filter while trans was empty; still no OD...
              Will use secondary ground today, will check OEM hole; I don't hear any movement in solenoid, only in OD relay...
              looks like time to remove interior to check elex connections....arrgghhh...thanks again

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              • #8
                Originally posted by stevew View Post
                I don't hear any movement in solenoid, only in OD relay...
                If as you say the relay is clicking, the problem is at the relay, the yellow/purple wire from the relay to the solenoid or the solenoid itself. Pull the yellow/purple wire from the relay and jump it to the battery positive terminal and listen for the solenoid click (it should be quite loud). If no click, check the yellow/purple wire bullet/sleeve connector above where the wires go into the gearbox cover. If still no click it should be the solenoid or its bullet/sleeve connector. If you have a multi-meter or test light, check for voltage down there with the yellow/purple wire jumped to the battery as a double check before replacing the solenoid.
                R3
                Jim Herter Copperas Cove, TX
                Original Owner ֍ 1970 TR6 ֎ CC 50990 LO
                VDU 506H

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                OD inoperable...

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