Author Topic: 1968 M-40 Kick down wiring?  (Read 2053 times)

Tinkerr

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1968 M-40 Kick down wiring?
« on: April 27, 2020, 02:22:21 AM »
I'm installing the trans kick down, but can't decipher the AIM illustration. The 2 single leads go to the kick down switch. The other plugs appear to wire into the wiper harness. Unfortunately I can determine how/where via the AIM illustration. Does anybody have a picture or wiring diagram. Thanks

firstgenaddict

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Re: 1968 M-40 Kick down wiring?
« Reply #1 on: April 27, 2020, 04:16:05 PM »
If I am not mistaken, there is a jumper harness which goes from the female side of the wiper plug you have pictured over to the washer pump connections.
James
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169INDY

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Re: 1968 M-40 Kick down wiring?
« Reply #2 on: April 27, 2020, 05:33:36 PM »
I have a shot of my 68 L35/TH400 Carb Kickdown sw w/wiring and connectors, I can look for a shot of the wiring at the wiper.
My Large color laminated wiring diagram is silent w/ regards to TH400 wiring.
Jim
68 SS/RS L35 Th-400 LOS
69 Pace Car L48 Th-350 LOS
68 Z28 M21 LOS

Tinkerr

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Re: 1968 M-40 Kick down wiring?
« Reply #3 on: April 28, 2020, 02:51:24 PM »
How the wiring/jumper ties into the wiper harness is not really clear in AIM. I could start plugging and unplugging things, but would prefer to get it right and avoid creating another problem. Thanks for the pictures. Paul

169INDY

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Re: 1968 M-40 Kick down wiring?
« Reply #4 on: April 28, 2020, 05:44:09 PM »
Your Harness color coding does not match my Orig.
The electrons do not care which is a good thing.

I am not sure of your level of electrical knowledge, said with respect.

Basically the Kick down switch Supplies HOT +12vdc to the sol in the side of the transmission. The switch "Gets" it Hot + 12vdc from a jumper off the wiper motor supply. So when you mash the throttle +12vdc is supplied to the kick down solenoid inside the trans opening a a small pintel valve porting hyd fluid to a lower gear hydraulic circuit. 

Your connectors  "look" fine but I am having trouble seeing how that will connect to your wiper motor and still supply a hot wire to your switch.

On mine the HOT wire from ie jumpered from the wiper motor +vdc is the Yellow wire & the 'Load' wire down to the solenoid is the orange wire.

I think on yours you should have a Yellow from the harness that plugs into next to the green-yellow & the double connector should plug into the wiper motor. The switch can go any order but I would go Green-yellow to the forward spade and the ?Pink? to the rear spade of the switch. You could then Jack the car up & test using a Volt Ohm Meter or Automotive Troubleshooting light & have a helper push the switch in and verify your have +12vdc at the input to the trans solenoid.

JIM
Jim
68 SS/RS L35 Th-400 LOS
69 Pace Car L48 Th-350 LOS
68 Z28 M21 LOS

Tinkerr

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Re: 1968 M-40 Kick down wiring?
« Reply #5 on: May 15, 2020, 03:33:41 AM »
Just a update, I believe I've resolved the wiring connections. Using the wiper wiring pages in the Aim I was able to, through the process of elimination and a little sleuthing, determine the correct kick down jumper connections. I thought the Aim would be more detailed in regards to the jumper connections. Thanks for the replies as always.