Higuys,

The horn suddenly went off at 6AM as if the relay welded itself, on a Sunday, so it's not moisture-related. I drove it the night before and it was warm (90) and dry.

Can you access the horn relay on a 1978 280Z without taking the glovebox out? Is it under the hood on the relay bracket? The FSM diagram isn't clear about it, but to say it looks like it's near the wiper relay, which means you gotta take the glovebox out.

I have a relay on order, so I just want to drive it s few times until I take it to the shop on July 14th.If I can get to it, I can swap it myself.

ThxZ

Edited yesterday at 02:44 AM1 day by TomoHawk

I have a 78 as well. My car currently has the dash out and I can tell you there aren’t any relays behind the glove box. Have you referenced the FSM? There are 3 locations the relays are located. Engine bay housing rh fender, under dash LH side of steering wheel. 3rd location rh side near the fuse box. Someone here on this forum can point you directly to the location.

Some of those relays near the fuse panel are easier to access with the glovebox out.

Are you sure the horn switch isn't stuck? The control side needs to be grounded to actuate the relay. Seems like that would have to happen before it could get "stuck".

It's on the relay bracket.

I will justy disconnect the horns, so I can drive a bit. The horn fuse is also for the brake lamps, so It has to stay in, and I will just pull the wires off the horns.