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Safe T Alert

August 23, 2012, 12:02:08 am

Good evening, I have a Safe T Alert carbon monoxide / gas alarm, model # 70-742 That has 12 volts on the ground wire with the positive wire energized. Anyone ever run into this?

Thanks, Mitch Sayer

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Re: Safe T Alert

Reply #1 – August 23, 2012, 12:16:18 pm

This sounds like the normal way of life for electrical circuits where only the +12 connection is wired. Connecting the ground wire to ground should make it work, so long as it doesn't blow a fuse.

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Re: Safe T Alert

Reply #2 – August 23, 2012, 12:43:10 pm

I would say that the alarm is like a switch where both legs can carry current.... just look at a light switch, same thing.

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Re: Safe T Alert

Reply #3 – August 24, 2012, 11:32:24 am

Good morning, I should have been a little clearer. The ground wire is heating up to the point that it is very warm almost hot to the touch. It acts like there is a load on it or a short. I hope to have time this weekend to dig deeper.

Thanks, Mitch Sayer

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Re: Safe T Alert

Reply #4 – August 24, 2012, 12:42:10 pm

It sounds like the gas saftey shut off solenoid is bad. You should check at the tank and see if there is a solenoid valve in the line coming out of the tank. Many people have removed or disabled this valve.

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Re: Safe T Alert

Reply #5 – August 24, 2012, 11:15:50 pm

Thanks for the tip Ron, I took the solenoid out of the loop and my back feed went away. I have 0 voltage on the ground.

Thanks, Mitch Sayer

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