Dodge Non-Specific:

Can we install a switch that will lock the auto transmission

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#1 2/25/2011 4:20 AM

Thor
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Registered: 2/25/2011
Posts: 2

Can we install a switch that will lock the auto transmission

We purchased  a 2009 Dodge Ram and outfitted it with a boom and winch for over embankment rescue.  Would it be possible to wire in a micro-switch that would lock the transmission in Park (with the motor running) while rescue personal are working in and around the truck.  Wondering if one of the 6 wires of the brake switch could be wired to a micro-switch at the rear compartment.

Beasley Fire Department

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#2 2/25/2011 10:33 PM

TechHelp2
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Registered: 11/24/2009
Posts: 1298

Re: Can we install a switch that will lock the auto transmission

The system locks the shifter into the PARK position. The interlock system is engaged whenever the ignition switch is in the LOCK or ACCESSORY position. An additional electrically activated feature will prevent shifting out of the PARK position unless the brake pedal is depressed approximately one-half an inch. A magnetic holding device in line with the park lock cable is energized when the ignition is in the RUN position. When the key is in the RUN position and the brake pedal is depressed, the shifter is unlocked and will move into any position. The interlock system also prevents the ignition switch from being turned to the LOCK or ACCESSORY position, unless the shifter is fully locked into the PARK position.

The six wire connector on the brake switch is for the lights and anti-lock brakes system. Don't tamper with these wires or safety will be compromised.

I'm not sure what you are asking because the truck will be locked in park as long as no person steps on the brake pedal.

If this is not the information you are looking for then please be more specific on what you want to do. The truck exact year, make, model, and any after market information on the items installed would be helpful.

Some of the information is from the Alldata Automotive information sight. If you need more specific information on the vehicle in question then you can find the information at ALLDATAdiy.com.


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#3 2/26/2011 2:35 AM

Thor
New member
Registered: 2/25/2011
Posts: 2

Re: Can we install a switch that will lock the auto transmission

I would like to thank you for your prompt reply to my question

The truck is a 2009 Dodge Ram 3500 series on gas.
This idea I had was to install a micro switch at the rear compartment and when the door was open a circuit would open/close.  This circuit would be in series to eliminate a depressed brake pedal to unlock the Park  in the transmission.

End result
Engine running, transmission in park, emergency lights flashing, rear compartment open with rescue in progress, 
TRANSMISSION CANNOT BE TAKEN OUT OF PARK (even by depressing brake pedal) UNTIL REAR COMPARTMENT DOOR IS CLOSED,

If this cannot be done we will go back to the steering wheel club and do not operate sign.
Thanks again
Thor

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#4 2/26/2011 3:27 PM

TechHelp2
Administrator
Registered: 11/24/2009
Posts: 1298

Re: Can we install a switch that will lock the auto transmission

It sounds like the micro switch would work at the rear compartment. The question is; does the switch that is factory installed open the circuit or close the circuit. You would also have to know if it is connected to any other system.

If you know the switch that controls this circuit, remove the wire and hook up an ohm meter. This is to check the operation of the switch. Manually move the switch form open and close as if the rear compartment was opening and closing. Find out if it opens the circuit or grounds the circuit. Your switch would have to do the opposite. The switch you install in series would have to trick the system telling it that it is closed. You would also have to see if this switch controls the light, door ajar switch, security system (if installed) and you would also have some sort of warning light telling any person that the rear compartment is open. Someone who is not familiar with the system would not know how to put the truck into park if the door or compartment is open or not closed all the way.

Investigate this first and see if it will work before finalizing any permanent system.

You could also hook up a toggle switch that is connected to the interlock system. Find the lock at the steering column and cut the ground wire (cavity 2 black and violet wire) to the switch and install a toggle switch in series. This will allow the transmission to stay in park all the time as long as switch is manually activated. It would just open the circuit when the switch is turned off.

Installing a small sign on the switch would identify the operation and the purpose of the switch for anyone who is not familiar with the alteration to the interlock system.

Again test your work out first before permanently installing your switch (s). 

If it is not possible for either procedure to work then the club sounds like a good and safe idea.


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