Alarm Schematic for 1975
Thread Starter
Instructor
Joined: Oct 2014
Posts: 215
Likes: 12
From: Conyers Georgia
Alarm Schematic for 1975
Does anyone have an alarm wiring schematic for a 1975? My alarm system was disconnected on the front fender and glassed over, but I thought I might try putting it back together while I have everything apart. I found the connection for the switch as well as the wires for the key-lock, but not sure about the rest of the system. I found a schematic for 69-70 thanks to Wilcox, but not sure about 75.
Assistance will be appreciated.
Assistance will be appreciated.
Thread Starter
Instructor
Joined: Oct 2014
Posts: 215
Likes: 12
From: Conyers Georgia
Thanks Beterbuilt, but I think the 75 is different. The car wiring diagram shows a switch(same switch as headlight open switch) next to the key switch in the side fender. I know that Wilcox has a flow type schematic for 69-70, but did not know if anyone had one for 75.
Le Mans Master
Joined: Aug 2006
Posts: 7,427
Likes: 1,560
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
You might need this switch.
If someone punches out the key switch then this switch completes the circuit and the alarm turns on.
http://willcoxcorvette.com/product_i...ducts_id=25898
If someone punches out the key switch then this switch completes the circuit and the alarm turns on.
http://willcoxcorvette.com/product_i...ducts_id=25898
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,754
From: Charlotte NC
LRB,
Obviously you can do to your car as you wish. But I can tell you that this alarm system is a JOKE and all it does is make noise and can drain your battery due to not having a 'shut-down' period built in it. A very primitive design compared to the later systems.
The later design is better where it has a starter disable or enable relay in it ( can't remember which one)...and it will stop blowing the horn after e few minutes and still keep the car in 'lock down' unless it is disarmed correctly.
DUB
Obviously you can do to your car as you wish. But I can tell you that this alarm system is a JOKE and all it does is make noise and can drain your battery due to not having a 'shut-down' period built in it. A very primitive design compared to the later systems.
The later design is better where it has a starter disable or enable relay in it ( can't remember which one)...and it will stop blowing the horn after e few minutes and still keep the car in 'lock down' unless it is disarmed correctly.
DUB
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Instructor
Joined: Oct 2014
Posts: 215
Likes: 12
From: Conyers Georgia
LRB,
Obviously you can do to your car as you wish. But I can tell you that this alarm system is a JOKE and all it does is make noise and can drain your battery due to not having a 'shut-down' period built in it. A very primitive design compared to the later systems.
The later design is better where it has a starter disable or enable relay in it ( can't remember which one)...and it will stop blowing the horn after e few minutes and still keep the car in 'lock down' unless it is disarmed correctly.
DUB
Obviously you can do to your car as you wish. But I can tell you that this alarm system is a JOKE and all it does is make noise and can drain your battery due to not having a 'shut-down' period built in it. A very primitive design compared to the later systems.
The later design is better where it has a starter disable or enable relay in it ( can't remember which one)...and it will stop blowing the horn after e few minutes and still keep the car in 'lock down' unless it is disarmed correctly.
DUB
I think you are right. I just need to let the dead alarm stay dead. It's just hard for me not to fix something that is broken. I will focus my time on getting the key buzzer and the horn to work.
I've know the horn is bad so hopefully that will fix that. I have tested all the other circuits and everything else see ok in the horn system.
Not sure why key buzzer not working.
Thanks for the advice.
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Got bored this morning and worked this up for you. 
Willcox
A revision will be posted tomorrow.
Willcox
A revision will be posted tomorrow.
Last edited by Willcox Corvette; Jan 25, 2015 at 06:09 PM.
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,754
From: Charlotte NC
DUB,
I think you are right. I just need to let the dead alarm stay dead. It's just hard for me not to fix something that is broken. I will focus my time on getting the key buzzer and the horn to work.
I've know the horn is bad so hopefully that will fix that. I have tested all the other circuits and everything else see ok in the horn system.
Not sure why key buzzer not working.
Thanks for the advice.
I think you are right. I just need to let the dead alarm stay dead. It's just hard for me not to fix something that is broken. I will focus my time on getting the key buzzer and the horn to work.
I've know the horn is bad so hopefully that will fix that. I have tested all the other circuits and everything else see ok in the horn system.
Not sure why key buzzer not working.
Thanks for the advice.
DUB
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Annoyance alarm is what I've always called it. A horrible design that always failed when you least expected it. Even more so on the newer 77-82 cars.
Well the diagram is something we've needed for a while so it's on the site now for future reference.
Ernie
Thread Starter
Instructor
Joined: Oct 2014
Posts: 215
Likes: 12
From: Conyers Georgia
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,754
From: Charlotte NC
There is a fiberglass bracket that is bonded to your fender that you can see in the illustration you posted.....and the switch #1 is positioned so the plunger is PUSHED IN so it is not setting off your alarm when you set it.
DUB
Thread Starter
Instructor
Joined: Oct 2014
Posts: 215
Likes: 12
From: Conyers Georgia
The switch you are referring to is a switch that GM installed....so if someone wanted to take 'dent puller'...and rip out your key switch in your fender....and IF the alarm was set....the plunger in the switch #1 would trigger the alarm because it is a tamper switch.
There is a fiberglass bracket that is bonded to your fender that you can see in the illustration you posted.....and the switch #1 is positioned so the plunger is PUSHED IN so it is not setting off your alarm when you set it.
DUB
There is a fiberglass bracket that is bonded to your fender that you can see in the illustration you posted.....and the switch #1 is positioned so the plunger is PUSHED IN so it is not setting off your alarm when you set it.
DUB
I just want to see where it ties into the schematic that Wilcox was nice enough to provide. I have all the wiring intact, so now I just want to see how it all works together and I did not see that on their diagram.
Thanks for the help.
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Good question.. I'll have to revise the schematic I left it out but I can't do it tonight.
The tamper switch had a black and white wire going to it. The black went to ground the white tied into the white wire for the door jamb switch. I'll see if I can update this tomorrow. In the mean time, we should both remove/edit our post removing the schematic, it'll keep someone else from being confused by a wrong diagram.
Willcox.
The tamper switch had a black and white wire going to it. The black went to ground the white tied into the white wire for the door jamb switch. I'll see if I can update this tomorrow. In the mean time, we should both remove/edit our post removing the schematic, it'll keep someone else from being confused by a wrong diagram.
Willcox.
Last edited by Willcox Corvette; Jan 25, 2015 at 06:13 PM.
Thread Starter
Instructor
Joined: Oct 2014
Posts: 215
Likes: 12
From: Conyers Georgia
Good question.. I'll have to revise the schematic I left it out but I can't do it tonight.
The tamper switch had a black and white wire going to it. The black went to ground the white tied into the white wire for the door jamb switch. I'll see if I can update this tomorrow. In the mean time, we should both remove/edit our post removing the schematic, it'll keep someone else from being confused by a wrong diagram.
Willcox.
The tamper switch had a black and white wire going to it. The black went to ground the white tied into the white wire for the door jamb switch. I'll see if I can update this tomorrow. In the mean time, we should both remove/edit our post removing the schematic, it'll keep someone else from being confused by a wrong diagram.
Willcox.
Will do, thanks.
Racer
Joined: May 2014
Posts: 420
Likes: 5
From: Springfield Missouri
According to, Ecklers, Willcox and Paragon, the key switch has been discontinued. I've only found one on the popular auction site and they want $150 for it right now. PM me if you want the link. The tamper switch though is easy, as it's the same switch used to light up your "headlamps" warning light. About $25 from the various vendors.
It's nice to have a wiring diagram just for this. I was able to trace the whole thing on the diagrams I have but this is better without the clutter of everything else.
Thanks Ernie.
It's nice to have a wiring diagram just for this. I was able to trace the whole thing on the diagrams I have but this is better without the clutter of everything else.
Thanks Ernie.