Push Button Auto L and D have disappeared

Posted by Peter Packard On 2024/6/3 1:30:01

Hello all, I have a PB Twin Ultra and Low and D no longer actuate. I am seeking some advice before I put it on the hoist. It still selects H and the other positions fine and has always been a very positive selection to L and D previously. The 56 Patrician has done 52,000 miles and the PB on the Steering Column has not been changed, but I replaced the trans a few years ago and Land D were always strong and positive. I have checked the terminal block from the Push Button control at the back of the dash and the terminal block is secure. I assume that selecting L or D should step the motor to the L position on the side of the box. The box should shift from L to the H position when the governed speed is reached to change from D to H, even though the PB will still be in the D position. I am looking for my next step. Should I remove the side plate from the step motor and check voltage from the PB control. Has anyone had this issue and what should I do next please? Peter T

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