How can one tell if their 77' came with the alarm option?

Easiest way to tell is look under the hood for the pin-switch, and inside the door jambs, below the striker where the door closes on the latch. If there are pin-switches there, the car had the alarm. I don't remember when the alarms were made standard equipment, off-hand, but I think it was '77 or '78.

Cool, how doesit work? I've searched a bit and found little info....

PIN SWITCH

The alarm is activated when you lock the door on the late '77s, but the early '77s had the key-switch in the fender. It's bascically just a hot circuit, with a relay, and a flasher. When the pin-swich grounds the circuit, the flasher beeps the alarm horn. The pin-switches are under the hood, and on both door-jambs, so when the door/hood was opened, the pin would ground, and the alarm would sound. Later cars also had switches on the t-tops.
I have some diagrams at the house, if you need them.

                                             click on imageAdams' Apple2006-10-30 20:02:36

Hi Timgman, My 77 has a factory alarm and it works just fine. It did not work when I bought the car, my mechanic hooked the wires under the hood correctly and it works. It is a switch alarm not a fender key alarm. Gene gs77vet2006-10-30 13:06:14

That's great... your vette looks alotlike mine.....
what interior color do you have?

I just hope that your seats aren't pleater re-pro'slikemine are hehehe

I to this day have never tried my alarm, maybe tomorrow

[QUOTE=Adams' Apple] Easiest way to tell is look under the hood for the pin-switch, and inside the door jambs, below the striker where the door closes on the latch. If there are pin-switches there, the car had the alarm. I don't remember when the alarms were made standard equipment, off-hand, but I think it was '77 or '78. [/QUOTE]


OMGOSH you mean my car actually came with an option...

Actually, I made a typo on that post. The alarms were made standard on the '73s, when they deleted the removable rear winder. What I really meant to say was when they changed to the door-lock key activation, instead of the fender key. Very early '77s still used the fender mounted key-switch, and then it went to the door-lock activated.

I don't thank yer gonna find a 77 with a fender key that is sportin the cross flags badge on it.

From what I have seen the ones that have the Stangray badge on em gots the key in da fender.