1972 Alarm System Power Source
Thread Starter
Heel & Toe
Joined: Jan 2014
Posts: 22
Likes: 1
1972 Alarm System Power Source
Hello All,
I've been trying to troubleshoot an inoperable alarm on my 1972 Base Model. (I'm using a factory schematic for this model, cleaned and tested all the components.)
My problem is that I have no voltage at the arming switch (on the rear deck), looking at the schematic it references a orange connection to the "body harness" and a pink wire running to the relay. What it doesn't show is the location where that orange wire receives voltage.
I believe that orange wire could terminate into the fuse box to supply the 12VDC source, but I haven't been able to find any connector, loose orange wire in that area or any orange wire(s) running down the door sills.
Is there anyone who could explain how the arming switch receives its voltage and where that orange wire runs from?
Thanks,
John
I've been trying to troubleshoot an inoperable alarm on my 1972 Base Model. (I'm using a factory schematic for this model, cleaned and tested all the components.)
My problem is that I have no voltage at the arming switch (on the rear deck), looking at the schematic it references a orange connection to the "body harness" and a pink wire running to the relay. What it doesn't show is the location where that orange wire receives voltage.
I believe that orange wire could terminate into the fuse box to supply the 12VDC source, but I haven't been able to find any connector, loose orange wire in that area or any orange wire(s) running down the door sills.
Is there anyone who could explain how the arming switch receives its voltage and where that orange wire runs from?
Thanks,
John
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,116
From: Crossville TN
I believe that an orange wire is one that is HOT all the time, but also feeds from the fuse block, so it is protected. Yellow is fused but hot only with ignition ON. If you don't have a fused/hot wire going to that location, you can create one by running a wire with an in-line fuse directly to the hot side of the battery.
Le Mans Master
Joined: Aug 2006
Posts: 7,423
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From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
72-73 Alarm
This schematic shows an ORANGE wire from the fuse to the on - off switch, then it comes out pink as the power goes to the relay.
Make sure the switch is ON.
Or maybe the colors have faded.
Make sure the switch is ON.
Or maybe the colors have faded.
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Le Mans Master
Joined: Aug 2006
Posts: 7,423
Likes: 1,558
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
From the factory the alarm circuit is protected by the CLK LTR CTSY fuse. If the fuse is good (on both sides) then I'll guess there is a break in the wires that run under the sill plate.
You can run a new wire and use the BAT lug to the feed side of your alarm key switch. The BAT lug is protected by the WIPER fuse.
You can run a new wire and use the BAT lug to the feed side of your alarm key switch. The BAT lug is protected by the WIPER fuse.
Last edited by Peterbuilt; Feb 26, 2014 at 10:12 AM.
Pro
Joined: Jul 2009
Posts: 557
Likes: 15
From: Royal Oak Michigan
Here are a few pics and a little conversation about the alarm harness in my 70. Might help.
http://forums.corvetteforum.com/c3-t...questions.html
http://forums.corvetteforum.com/c3-t...questions.html
Pro
Joined: Jul 2009
Posts: 557
Likes: 15
From: Royal Oak Michigan
The ease of getting into the car VIA convertible tops and T tops would be my guess. You could walk away with a FI unit without opening the doors if not for the hood switch.
But I agree, doesn't seem to add much more protection.
But I agree, doesn't seem to add much more protection.
Melting Slicks
Joined: Oct 2013
Posts: 2,569
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From: San Diego California
Advanced
Joined: Sep 2013
Posts: 53
Likes: 0
From: Pflugerville Texas
Melting Slicks
Joined: Oct 2013
Posts: 2,569
Likes: 126
From: San Diego California
Thanks! Nice to know when that Release Handle Cable breaks.
