[unruhjonny]

I was wondering if anyone here might be able to help me out.

I am preparing for doing a table at a swap meet next weekend, and I have a horn relay here;
At a glance it's NOS, but the box is open;
I cannot be completely sure if this is unused (again the box is open), and there appears to be weathering on it, but the contacts look unset - while the tin ends on the container have zero weathering on them.

The part number on the container is 1116781

I did just check, and it isn't applicable to my Fireibrd according to my November 1974 printing master parts catalogue, but maybe it was superseded by another number which makes it interchange!?

Can someone also offer a means for me to test it if it's good?

I can see a sealed one recently sold on eBay for $150usd plus shipping, so I figure it's worth looking into this one.

[Firedup6975]

Originally Posted by unruhjonny

I was wondering if anyone here might be able to help me out.

I am preparing for doing a table at a swap meet next weekend, and I have a horn relay here;
At a glance it's NOS, but the box is open;
I cannot be completely sure if this is unused (again the box is open), and there appears to be weathering on it, but the contacts look unset - while the tin ends on the container have zero weathering on them.

The part number on the container is 1116781

I did just check, and it isn't applicable to my Fireibrd according to my November 1974 printing master parts catalogue, but maybe it was superseded by another number which makes it interchange!?

Can someone also offer a means for me to test it if it's good?

I can see a sealed one recently sold on eBay for $150usd plus shipping, so I figure it's worth looking into this one.

What year Firebird is it for?

[unruhjonny]

Originally Posted by Firedup6975

What year Firebird is it for?

I bought it recently not as a Firebird part per say...
I have a 1970 Firebird (see signature below).

[lemansboy70]

Take this for what its worth. Our info can be sketchy at times.

The Napa number is HR101. Supposedly for 1955-56 Pontiac and many other applications.

[Firedup6975]

Originally Posted by unruhjonny

I bought it recently not as a Firebird part per say...
I have a 1970 Firebird (see signature below).

I saw your signature but sometimes people are asking for other cars or reasons, I asked because I think you might get better responses in the tech forums for the appropriate year you’re needing help with.

Good luck!

[Shiny]

I'm not an expert but here's my guess.

Based on this image from an eBay posting, there are 3 terminals: "Horn", "Battery", and "Switch".

To test basic function you will need to power it and verify the horn contacts close. If you connect +12V to the "B" terminal, and ground the "S" terminal, you should be able to hear a click. This would confirm the coil is actuating the contacts.

To fully verify the contacts are capable of switching high current, you would have to attach a horn or some other high-current device. The horn would have one terminal grounded and the other terminal connected to the "H" terminal on the relay. Both the horn and the battery wires would need to be stout and connected solidly. A horn probably has a big coil which could create quite a spark and shock risk if you try just touching a wire. Be careful if you go this way.

['ol Pinion head]

my early 70's GM books also show '55-56 usage. My newest (1977) dealer parts & accessory price guide shows Chev, Burick, Olds, Pontiac, Cadillac divisional usage.

Without having several original late 50's GM master parts books to confirm original part numbers, the horn relay may be a service replacement for an earlier part number. Also, having bought out numerous dealership stocks, one has to be careful with original boxed electrical parts. Years ago, I got into a deal where there were a bunch of NOS voltage regulators as well as different styles of relays where the strings had been pulled/original containers were opened. Containers were empty but numerous parts were out on the shelf collecting dust. Took some time to confirm what each part was.