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Ben Jordan

ZF auto box inhibitor switch

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Over the last couple of days it would have been useful to be able to override the inhibitor switch on my Range rover classic auto so i could of started it in gear. I know that this can be done by fitting a switch, now all i need to know is HOW??

Is it just a case of the inhibitor switch being under gear selector and taking it out of the circuit by fitting a switch in parallel that when closed lets the gearbox think its in park??

I have done a search and looked in the technical archive but to no avail.

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Yes you just need to wire another switch in parallel. This is exactly what I have done on the ZF I've just put in a 90. On the front nearside of the gearbox box near the gear change mechanism is a cable with a round round 4 way multi connector, 2 of these wires are for the start inhibit switch and the other 2 are for the reverse switch. Can't remember the colour codes for these, best check a suitable wiring diagram. Exactly where they then go in a RRC I couldn't say but in my 90 I wired them between the ignition switch and the starter relay along with an over ride switch in parallel.

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Just join the wires - the switch is in series with the starter relay. If you want it "switchable" then wire another switch in parallel with the 'box one.

Edited to add - the wire should be White/Red.

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You will fail the MOT if it starts in gear so Fridgie's suggestion would need to be reversable or bypass-able come MOT time.

Why would you want to start it in gear out of interest?

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You will fail the MOT if it starts in gear so Fridgie's suggestion would need to be reversable or bypass-able come MOT time.

Why would you want to start it in gear out of interest?

I went for starting in gear ONLY with your foot on the brake but out of gear without foot on brake.

Bish. If you want to resart in a hurry do you really want to be fumbling into neutral and then into gear? I prefer to be able to turn the key and have it work. The ideal example is a failed hillclimb.

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This may be over-complicating things, but if you connected a relay to the brake light feed that switched in and shorted the inhibitor wires then you would have a car that only started in Park OR when you had your foot on the brake.

May still want an over-ride switch for the MOT though...

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On 2/2/2006 at 7:59 AM, Mark90 said:

Yes you just need to wire another switch in parallel. This is exactly what I have done on the ZF I've just put in a 90. On the front nearside of the gearbox box near the gear change mechanism is a cable with a round round 4 way multi connector, 2 of these wires are for the start inhibit switch and the other 2 are for the reverse switch. Can't remember the colour codes for these, best check a suitable wiring diagram. Exactly where they then go in a RRC I couldn't say but in my 90 I wired them between the ignition switch and the starter relay along with an over ride switch in parallel.

Something of a resurrection but I've just sorted out the reversing light switch on my '86 RRC ZF auto.

The green wire is the reverse lights live feed from fuse 13 & the reversing light switch connects it to the green/brown wire which goes to the reversing lights.

The other two wires are the start inhibit.

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