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Old 06-06-2013, 09:07 PM   #1
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Propane Alarm Which Battery?

I'm replacing the propane alarm in my Discovery. The original had three wires, a ground, one from the chassis battery, and one from the house batteries. The new alarm has just two wires, a hot and a ground. Which battery should I wire it to, the chassis or the house. Thanks in advance
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Old 06-06-2013, 09:52 PM   #2
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You could wire the hot to chassis and house.
But usually just house.
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Old 06-07-2013, 05:43 AM   #3
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I just went through this. FW told me to connect the two red wires to the one on the alarm. I did and it works well. Here's a link to my thread on this.
LP detector / alarm
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Old 06-07-2013, 04:21 PM   #4
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FW told me to connect the two red wires to the one on the alarm.
That provides power to the alarm from both sources. The problem with doing that is that you just cross-connected the house and chassis batteries. Now the house can pull power form the chassis battery, which could conceivably lead to a dead chassis battery if you ever boon dock.
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Old 06-07-2013, 04:23 PM   #5
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That provides power to the alarm from both sources. The problem with doing that is that you just cross-connected the house and chassis batteries. Now the house can pull power form the chassis battery, which could conceivably lead to a dead chassis battery if you ever boon dock.
Good point. Not an issue for me. No plug/ no camping
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Old 06-07-2013, 09:12 PM   #6
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Quick question. Is there a solenoid shut-off valve on your propane tank? If so, one of the wires goes to that solenoid and you will need a different alarm to make it all work.
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Old 06-09-2013, 03:41 PM   #7
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Quick question. Is there a solenoid shut-off valve on your propane tank? If so, one of the wires goes to that solenoid and you will need a different alarm to make it all work.
I don't think one of them is for a solenoid. I checked both reds coming from the harness with a volt meter and figured out which one was house and which one was chassis.
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Old 06-09-2013, 03:43 PM   #8
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UPDATE.

I wired it to the house batteries only. We boon dock so the batteries are always charged up by the generator and the alarm is not connected to the chassis so there is no chance of draining those batteries.
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Old 06-09-2013, 04:17 PM   #9
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That provides power to the alarm from both sources. The problem with doing that is that you just cross-connected the house and chassis batteries. Now the house can pull power form the chassis battery, which could conceivably lead to a dead chassis battery if you ever boon dock.

Good advice Gary! I think that would be a definite no-no for the exact reason you mentioned. I'm sure the original detector had circuits to prevent this from happening.
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