72 Anti-Theft Question

[Mark E.]

Re: 72 Anti-Theft Question

Jeff, going to replace BOTH the one in the storage bin and the one in the fuse block. Then re-check alarm and hazzards. Would be ironic to have 6 figures into a restoration and get hosed by a 5 dollar flasher! LOL

You can replace a bunch of parts and hope to stumble upon a fix, or first troubleshoot the cause.

[Guy B.]

Re: 72 Anti-Theft Question

You can replace a bunch of parts and hope to stumble upon a fix, or first troubleshoot the cause.

Mark, no doubt you are correct and the best way is to trouble shoot. Gunna try the flasher and check the relay contacts. After that have to choice but trouble shoot. I sense its something dumb. Not really set up to trouble shoot and the person that did the restoration is too far to bring the car. Looks like a pretty simple system.

[Gary B.]

Re: 72 Anti-Theft Question

Each door should have three wires to the rear switches, white, black and light blue. The switch under the hood has two wires, a black and white. If you here the relay licking, its getting power. I would replace the flasher. A 536 like you show is what they originally used.

A few weeks ago, I had a car where the alarm worked, with the doors closed or open. I removed all the switches and stuck a popsicle stick in them to make sure they were not making contact. It still honked when I turned the switch. Long story, made short, the black wire on the hood switch goes to the ground on the wiper motor. The white wire goes through the firewall and routes over towards the drivers side kick panel, where it plugs into another wire that goes back to the "other" white wires. When somebody, or GM, put the column in, they pinched the white wire where the column bolts together with upper column bracket. It pinched the wire in-half, causing a ground. I loosened the column and moved the wire out of the way, re-tightened the column. With the wire out of the way, I could turn the switch on and no horn. I cut and spliced the wire back together, it the system worked perfectly.

Moral of the story, trace the wires. One may be grounded by a screw, or ????

Only spent about a full day looking for that !

Gary B

[Jeffrey S.]

Re: 72 Anti-Theft Question

Each door should have three wires to the rear switches, white, black and light blue. The switch under the hood has two wires, a black and white. If you here the relay licking, its getting power. I would replace the flasher. A 536 like you show is what they originally used.

A few weeks ago, I had a car where the alarm worked, with the doors closed or open. I removed all the switches and stuck a popsicle stick in them to make sure they were not making contact. It still honked when I turned the switch. Long story, made short, the black wire on the hood switch goes to the ground on the wiper motor. The white wire goes through the firewall and routes over towards the drivers side kick panel, where it plugs into another wire that goes back to the "other" white wires. When somebody, or GM, put the column in, they pinched the white wire where the column bolts together with upper column bracket. It pinched the wire in-half, causing a ground. I loosened the column and moved the wire out of the way, re-tightened the column. With the wire out of the way, I could turn the switch on and no horn. I cut and spliced the wire back together, it the system worked perfectly.

Moral of the story, trace the wires. One may be grounded by a screw, or ????

Only spent about a full day looking for that !

Gary B

Gary,
Many years ago, when my '69 was a daily driver, I discovered that neither my windshield wipers or heater blower was working. After many hours of trouble shooting, I got in the car with the door open and tried them. They both worked. Job done, right?. Closed the door and started the car to go somewhere and while driving neither worked. Opened the door while both were on and they jumped to life. Finally checked the ground at the starter and the wire was broken off. The wiper and blower were grounding through the alarm system ground at the wiper motor.