This is a pic of the relay bracket from a 77 Z. There are mounting holes for relays that my car does not have. Does anyone know what the relays are that screw to this side? What are the functions of the two relays that screw to those four mounting holes on the side that faces forward toward the headlights:

And for posterity, here are the other three sides. This is the side that faces the engine. The four screws attach the two fusible link blocks:

Here's the side that faces the battery. The relay in the pic (I believe) is for the air conditioning compressor:

And here's the side where the voltage regulator would mount:

Bruce, is this what you're looking for? Datsun 280Z Electric Unit & Switch (1) (From Dec.-'74)

Edited September 16, 201410 yr by SteveJ

Thanks, but I don't think so. That stuff is mostly on the interior above the fusebox and I'm out in the engine compartment.

Here's some sketches from the 77 FSM that seem to corroborate that the solo relay attached to the bracket in my pics above is for the air conditioning compressor. And it also appears that one of the relays to be mounted on the front side is for a seat belt interlock on the auto trans cars (#4 in the diagram). But what's got me is that I've got room and mounting holes for TWO relays on that front side, and I have absolutely no idea what the other one would be for:

Here's another sketch from the FSM that shows a little more detail about the seat belt interlock relay.

Capt, the only ones my 77 have are the voltage regulator and a/c relay (compressor) and condenser of course.

Thanks for the help. I'm assuming your car is a manual trans? That would make sense that you don't have the seatbelt starter interlock relay.

I have some photos of mine when I was cleaning it up. Im at work so I can post then this evening if you want.

From what I can recall, its like Rob says. Voltage regulator en A/C relay in the manual trans model.

Great! I'd appreciate any pics.

The issue for me is that I'm planning some electrical changes and I'm wanting to repurpose some of those mounting locations for other things and I don't want to put something new in a location that I'll regret using at some future time.

I have a manual trans car so the seat belt interlock location is up for grabs, but can't figure out that other set of mounting holes on that front side.

Anyone got pics of a 78 bracket configuration? Rossiz, if you're reading this, can you maybe stick a camera down in there and take a couple pics of the 78 design? Maybe they had holes laid out in 77 but didn't use them until 78?

Yes, mine is a manual trans.

Captain,

Here are some photos of my relay bracket. The car is a stock Californian 5/77 manual transmission with A/C.

That is exactly how mine is set up. But yours looks much "cleaner" than mine Chas. You must have bought your Voltage regulator from Rockauto. Mine came with that same in line fuse.

Not trying to jack your thread Capt :classic:

No worries!

Bob, Thanks for the confirmation on the trans in your car and Chas, thanks for the pics. Those are great shots. I appreciate the help from both of you!

PS - Bob, yeah Chas' car is a lot cleaner than mine too, but I don't let it get to me. Mine's much faster, and if he doesn't believe that, he's welcome to bring his around for a good ol' fashioned drag race. :laugh:

Edited September 16, 201410 yr by Captain Obvious

:classic: C'mon Capt. share those secrets on making a 280 faster. Inquiring minds need to know.