Clutch Interlock Switch
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Clutch Interlock Switch
Hi
I have a 1989 F150 XLT Lariet, four speed standard.
I would like to disable the Interlock switch that makes you unable to start the truck without depressing the clutch way down. I have a Haynes book and it shows this switch mounted to the clutch master cylinder plunger rod. There is a connector there with allot of wires. The schematic shows a red and light blue wire for this switch. Do I snip this wire and ground it?
I would appreciate some help with this because this clutch is pretty hard to push down as far as you need to to start this truck.
Also I never try and start my other cars that have manual transmissions while they are in gear so I think I'll be safe.
Thanks
Don
I have a 1989 F150 XLT Lariet, four speed standard.
I would like to disable the Interlock switch that makes you unable to start the truck without depressing the clutch way down. I have a Haynes book and it shows this switch mounted to the clutch master cylinder plunger rod. There is a connector there with allot of wires. The schematic shows a red and light blue wire for this switch. Do I snip this wire and ground it?
I would appreciate some help with this because this clutch is pretty hard to push down as far as you need to to start this truck.
Also I never try and start my other cars that have manual transmissions while they are in gear so I think I'll be safe.
Thanks
Don
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From: Virginia
Clutch Interlock Switch
No, you need to put a jumper to connect the two red/lightblue wires. You could cut the wires, and then twist them together. But I would try to make it so you could put it back in case you sell the truck, or if somebody less experienced starts driving the truck.
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Clutch Interlock Switch
Dave
Thanks! This is what I was looking for. Are you sure about these two wires? The reason I ask is because they changed the setup for this after 1987. You solution will definitly apply to a 1989 F-150?
Don
Thanks! This is what I was looking for. Are you sure about these two wires? The reason I ask is because they changed the setup for this after 1987. You solution will definitly apply to a 1989 F-150?
Don
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From: Virginia
Clutch Interlock Switch
Well you said red/lightblue so I assumed it was the same. It doesn't make sense they would wire it another way, but you can never tell. If you have a red/lightblue on your starter solenoid, it's got to be wired the same.
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Clutch Interlock Switch
Hi
I was just making sure you were not using your truck as an example because I think the pre 1988 trucks with Interlock had way fewer wires on the connector in question down by the clutch cylinder plunger.
DS
I was just making sure you were not using your truck as an example because I think the pre 1988 trucks with Interlock had way fewer wires on the connector in question down by the clutch cylinder plunger.
DS
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From: Virginia
Clutch Interlock Switch
I am trying to think what the other wires would be for. One thing that comes to mind is the cruise control if you have one. You would want the cruise to disengage if you pushed in the clutch.
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Joined: May 2003
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From: PA
Clutch Interlock Switch
I was just going to ask how to disable the clutch interlock switch on our "new" '88 F-150 Custom. The truck will not start 9 out of ten times, the clutch has to be stomped on just right. Might the switch be bad or need cleaning? Also, the clutch linkage as it goes to the right, above the accelerator, seems like it has a lot of play. Some kind of a black slotted spacer fell out. It is about 3/8" in diameter and 1/2" long.
I will greatly appreciate and insight as to my next steps to get the truck running safely.
I will greatly appreciate and insight as to my next steps to get the truck running safely.
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From: Virginia
Clutch Interlock Switch
The color wires should be the same as the previous threads. You could jump the wires for a couple of days to make sure it's the problem, and then buy a new switch. The plastic thing sounds like a bushing for the linkage. Try taking it to the ford dealer and see if they can find the part number. I looked in my Haynes manual and it does have an exploded view of the under dash clutch system.
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Joined: Nov 2002
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From: Memphis, TN
Clutch Interlock Switch
That switch is adjustable to get it to close with normal pedal operation. You shouldn't have to short around it. The Haynes manual tells how to set it. If it won't set, then it should be replaced.
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