Brake light

[f100cleveland]

On a E-450 the brake light stays on all the time. If you take the wire off the switch and ground it, it makes no difference. The AIC kicks on every time you put it in park. The cruise control does't work ether. Any ideas?

 

[whatabudro]

I would inspect the factory wiring bundles under the dash, and possibly thru the firewall. It almost sounds like there is something METAL that has rubbed thru the insulation and is connecting the circuits. This has happened to me on my nova.

 

[Crumm]

Does it have a trailer brake controller installed?

 

[f100cleveland]

It does't have any kind of trailier harness but it has a handycap lift that somehow is tyed into the neutral safey switch.

 

[f100cleveland]

Found it. Added 1/4 inch of fluid to the master cylinder and the light went out. It didn't tell us to look for that in the trouble shooting guide.

 

[whatabudro]

Did that fix the AIC, and cruise control too?

 

[f100cleveland]

Yep it fixed all the problems.

 

[Crumm]

Glad you fixed it. I was for some reason thinking you were talking about the brake lights on the back of the rig not the bake light in the dash. There are a whole different set of things to check if that light is on rather than the brake lights. Thats a big DUH on my part, you said brake light not lights.

 

[f100cleveland]

I didn't explain it very well so I'll share the DUH with you.