Replacing the clutch safety switch harness/possible fuse?

[Kielly]

Long story short, went to install Auxbeam switch panel last night, ran the wires through the firewall, as I was doing that heard a small snap/crack and thought nothing of it. Could've been electrical, could've been something breaking.

Went to go start my truck this morning, would not crank. After an hour of panic and pulling fuses I thought about the clutch safety switch. Thank god for the clutch cancel button as it allows me to start my truck but my truck still thinks the clutch isn't depressed so with every gear change the rev hang is extremely high.

Everything is plugged in as it should be, but I fear I damaged the connection where it exists the firewall, besides it being an absolute pain in the ass to fish anything through the firewall with no room for hands of any sizes, how much of a pain is it to replace that whole harness or what are my viable options? I'd love to just bypass the clutch safety switch all together permanently but I fear that won't fix the rev hang issue, the truck must know the clutch is depressed.

Also, anyone know if the switch is possibly tied to it's own fuse, before I go searching after work today?

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[BLtheP]

I can’t help with questions about the circuit itself as it’s different from the previous gen that I’m used to which was more simple for key starting. The safety switch used to simply complete the circuit for the starter relay power trigger, but now I believe it plays a small role in a more computerized process with the push to start button and it simply just looks at the clutch depression as one input in that whole environment.

I do know the safety switch itself is the same as 3rd gen and I have a bypass jumper for the the old truck that I can try plugging in and see if everything functions that way. Right now your truck is seeing it like you’re driving without the clutch, whereas with the jumper it’s like the clutch is pressed all the time.

All that to say if my test proves problem free driving, then you can solve your problem by making a similar jumper. My only issue with that is I’d be a little concerned about accidentally hitting the push button when in gear, and also nervous a service doofus might accidentally drive the truck into a wall. On my 3rd gen when I remembered, if I was getting tired or inspection or anything I’d try to remember and remove the jumper to put it back to stock to protect it from others. From myself I only accidentally cranked it in gear once and it was in an empty parking garage with the parking brake set. I kind of want to bypass the 4G.

 

[BLtheP]

I got it swapped and test drove and it seemed like the rev hang was also bad. Then I undid it and the rev hang was/is still bad. So now I can’t tell if it’s worse than normal (and will correct itself soon) or if I just don’t pay a lot of attention to rev hang on my truck and its always like this. I don’t think it’s always like this.

Even if you did bypass, you’ll have to figure out the breakage in the circuit for it to be effective, but I’m going to guess that bypassed or not is going to cause similar rev hang. I don’t think what I just saw in mine is normal.

I’ll dig into the wiring diagrams and see if I can find all the info on the clutch circuit.

 

[Kielly]

I got it swapped and test drove and it seemed like the rev hang was also bad. Then I undid it and the rev hang was/is still bad. So now I can’t tell if it’s worse than normal (and will correct itself soon) or if I just don’t pay a lot of attention to rev hang on my truck and its always like this. I don’t think it’s always like this.

Even if you did bypass, you’ll have to figure out the breakage in the circuit for it to be effective, but I’m going to guess that bypassed or not is going to cause similar rev hang. I don’t think what I just saw in mine is normal.

I’ll dig into the wiring diagrams and see if I can find all the info on the clutch circuit.

Thanks for looking into it, much appreciated.

I'll probably try to by-pass it myself as well just to see how the rev hang acts, there's always bad rev hang but in my current state the rev will literally stay where it was when I let off the gas, until I either hold the clutch for an incredible amount of time, or just slowly release the clutch.

If I'm able to bypass/jump it and get my rev hang issue back to normal I'll just do that and leave it be. I'm not too worried about starting it in gear as I've made quite the habit to not only neutral check when I get in, but also hold the brake during start.

At least then I guess I could wire up a hidden kill switch lol

 

[BLtheP]

Thanks for looking into it, much appreciated.

I'll probably try to by-pass it myself as well just to see how the rev hang acts, there's always bad rev hang but in my current state the rev will literally stay where it was when I let off the gas, until I either hold the clutch for an incredible amount of time, or just slowly release the clutch.

If I'm able to bypass/jump it and get my rev hang issue back to normal I'll just do that and leave it be. I'm not too worried about starting it in gear as I've made quite the habit to not only neutral check when I get in, but also hold the brake during start.

At least then I guess I could wire up a hidden kill switch lol

Yeah, I really don’t pay attention to the rev hang during normal driving so it’s hard to say if mine was acting up after the test or not. It definitely doesn’t just hang there for super long amounts of time like yours seems to be doing, so maybe the bypass will work for you.

These diagrams are not very easy to read. It seems like your first place to look is around the firewall A56/57 junction connector as it appears both the blue and red wires going to the safety switch run through there. I’d assume that’s where the connection got broken. But if so, I’d think other stuff runs through that connector as well and that you have other problems too. Maybe not though.

A33 is the safety switch connector and A56/57 are a junction where wiring runs in and back out.

 

[Kielly]

Yeah, I really don’t pay attention to the rev hang during normal driving so it’s hard to say if mine was acting up after the test or not. It definitely doesn’t just hang there for super long amounts of time like yours seems to be doing, so maybe the bypass will work for you.

These diagrams are not very easy to read. It seems like your first place to look is around the firewall A56/57 junction connector as it appears both the blue and red wires going to the safety switch run through there. I’d assume that’s where the connection got broken. But if so, I’d think other stuff runs through that connector as well and that you have other problems too. Maybe not though.

A33 is the safety switch connector and A56/57 are a junction where wiring runs in and back out.

You're awesome! Thanks man

 

[BLtheP]

Just wanted to add that I paid attention last night and today and rev hang went back to normal. So I would assume me bypassing the clutch with my jumper created an undesirable result in the rev hang department unfortunately. But maybe more testing will rule that it was coincidence and that it actually works fine long term bypassed.

Interested to see your results when you find the fix the break in the wiring and then whatever direction you go with it in regards to bypassing once fixed.

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