1997 6.5 Suburban with no brake lights

[malpana]

Hi, all. The brake lights on my '97 stopped working, but all the other lights work. Before I condemn the switch at the brake pedal, I'd like to check for power out of it at the relay terminals. There's no brake relay in the fuse/relay box under the hood (driver's side), and no female terminals in it to receive a relay anyway, even though the cover diagram says it should be there. Does anyone know where the brake light relay is located? Thanks in advance.

[malpana]

I should have said that the previous owner wired in a TAP Brake Master for towing. I don't know anything about that system.

[a5150nut]

IIRC my 94 had another fuse panel on the left end of the dash. Door open you can remove the cover to access it

[malpana]

Thanks, a5150nut. The fuse in that block is good. I'm trying to find the square 4-pin relay that, at least on other GMT400s, is in the relay box under the hood.

[malpana]

It's the switch. I jumpered the orange and white at the switch connector and got brake lights back. I have a vague recollection from years ago, when I replaced the switch before, of losing a really thin metal bushing that slips over the post where the switch sits before you put the switch on. Does anyone know anything about a bushing? I don't mean the retaining clip.