Cruise/Trans Switch

[Ωhm]

That photo missing the back half, I can see how the servo vacuum dump valve works now.

[Ωhm]

On 12/18/2021 at 12:32 PM, eaglescout526 said:

 

When you come across this switch, can you put it on the bench and connect an ohmmeter across the terminals. Let me know if it's OPEN or CLOSED circuit? TIA

[eaglescout526]

20 minutes ago, Ωhm said:

When you come across this switch, can you put it on the bench and connect an ohmmeter across the terminals. Let me know if it's OPEN or CLOSED circuit? TIA

I’ll give it a quick test today.

[Htchevyii]

On 12/14/2021 at 4:38 PM, cruiser54 said:

Hi Cruiser54,

I'm finishing up my 96 booster swap and eliminating the terrible Bendix 9 ABS in my 89 XJ. My old brake lamp switch has 4 terminals, all of which have wires going to them. Clearly the wires are going to the same place, (terminals joined together on the switch), so I suppose I could splice those together. What is the function of the vacuum dump valve? There isn't a down side with eliminating it? Thanks for you help.

[cruiser54]

The vacuum dump valve dumps the vacuum from the cruise control servo.

It also signals the TCU that the brakes have been applied so the torque converter is unlocked. 

 

Wanna see a trick work around for brake and TCU interrupt switches? No screwing around with the booster rod and that funky old brake light switch. 

 

 

[Htchevyii]

I have that switch, but by using it you are deleting the dump valve, correct? That doesn't cause any issues?

[cruiser54]

The one I show above is a Cadillac switch which replaces the dump valve and the funky original brake switch that requires the customized end on the booster rod. 

[Htchevyii]

I have that switch, but by us

1 hour ago, cruiser54 said:

The one I show above is a Cadillac switch which replaces the dump valve and the funky original brake switch that requires the customized end on the booster rod. 

Thanks Cruiser, I have the SL186 I'm just wondering how deleting the vacuum dump affects the cruise control? Maybe they also used the switch with the dump valve on non cruise trucks and that's why it can be deleted?

[cruiser54]

If you have cruise, keep the dump switch. 

[Htchevyii]

On 12/14/2021 at 4:38 PM, cruiser54 said:

Thanks, I welded a piece of flat stock to the pedal so that I can use both switches side by side in the existing factory mount.