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Old 07-27-2011, 04:18 PM   #1
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Battery Isolator Relay or Solenoid

House batteries and system OK. 12 volt batteries measure 12.75 and 13.8 with engine running. Starts OK. Coach has 2 battery disconnects but the one by the front door does not work. Voltage is 6.65 at the relay and solenoid and at the meter inside the coach. My question is is it the relay, solenoid, or disconnect switch or any combination there of. Thanks, Jerry
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Old 07-27-2011, 04:39 PM   #2
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Fairly sketchy information. It sounds like your talking about the battery disconnect switch for the coach batteries. Not sure about the 6.65 volts. Do you have separate solenoid and relay or all one unit? The disconnect switch isolates the battery from the coach's 12 volt system. One one side you should read regular battery voltage(12.5 volts DC) on the other side should be 0 volts DC. The relay controls the operation of the solenoid so if you operate the disconnect switch and you don't hear the solenoid operate then you have to make sure voltage is being passed thru the relay to the solenoid. If it is then the solenoid is defective if not the relay is defective.
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Old 07-27-2011, 05:09 PM   #3
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What changes or maintenance have you recently done? If you have 6 volt batteries it sounds like something has been connected improperly.

What are you using for the negative lead of your voltmeter to ground to?
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Old 07-27-2011, 05:20 PM   #4
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Just bought the coach, 2003 Jayco Avatar and the dealer installed new 6v batteries. But, if I understand correctly, it is the chassis batteries that are showing 13.75 engine running and 6.65 at the relay and solenoid ( they are seperate pieces) On this coach the slides operate on the chassis batteries. They will not work, and I had to use the aux battery boost it get them to retract.
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Old 07-27-2011, 05:26 PM   #5
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The contacts in the solenoid carry the high current. They wear, get burned and don't make good contact. The voltage may be different each time the solenoid is opened and closed because a poor connection in the solenoid.
The relay is powered from one of the battery sets. It should read just a little less than the battery it is powered from.
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Old 07-27-2011, 05:52 PM   #6
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I think we need to concentrate on the connections of the "new" 6 volt batteries. I sounds like they be connected in parallel instead of series. Can you describe how the batteries are connected? Even better, can you provide pictures of the battery bank.
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Old 07-27-2011, 07:29 PM   #7
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I have a picture of the batteries, but cant seem to upload them from the phone. I can email them. jpmal1@yahoo.com
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Old 07-27-2011, 09:28 PM   #8
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what kind of phone?
IRV has a smartphone app that is both free and works really good. It's based on forumrunner, and available for iphone and android. It makes uploading pictures a snap.
You can download the app from the iphgone store, or the android market.
smartphone users, no excuse for not posting pictures. We like pictures.
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Old 07-27-2011, 09:41 PM   #9
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There should be nothing in your coach that is powered by 6.65 volts. Sounds like RJay has got it figured out.......your house batteries are not wired correctly.
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Old 07-28-2011, 01:24 AM   #10
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OK, if the house batteries are wired incorrectly, how does that make the chassis batteries show only 6.65 volts at the solenoid and relay?
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Old 07-28-2011, 04:03 PM   #11
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Here is the picture for everyone. The batteries look like they are hooked up correctly. I would definitely clean those binding posts up and make the connectors shiny and new because that can cause some difficult issues but not this one.

I would like to see a picture of the other battery too. You could be getting some misleading voltage measurements if using a digital meter.
To isolate things try this. Disconnect the negative lead of the batteries shown. Then try to start the rv. If it starts measure the voltage across the engine batteries. If it doesn't start measure the voltage anyway.
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Old 07-28-2011, 04:35 PM   #12
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Are these batteries connected correctly? Looks like they might be connected in parallel giving 6.++ volts not 12.++ volts if connected in series. This could be why the readings are not was would be expected. A drawing of the circuit would be helpful.
Just a thought.
JB
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Old 07-28-2011, 04:46 PM   #13
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The black wire going to the red wire in the background what is that doing? Is that a mechanical standoff or is it connected to the red wire?
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Old 07-28-2011, 04:56 PM   #14
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The batteries are hooked up correctly. One set in series. the second set in series. both sets in parallel. The only thing i don't get is the black ground wire running left to a red positive wire.
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