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Old 07-20-2003, 11:14 AM   #1
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How does this work???

I think I understand what I see, but I have some questions.


I belive the relay is my cross connect relay for boost starting, but I have no way to manually trigger it. Am I missing something?

Measuring voltages shows me what wires go to what batteries, does any one else have this setup?

I have voltage on my gray wire (AC POWER) and the fuse, but no light on the panel. I know we discussed this in the past, but what makes the panel light work?

Were is my Battery Isolator, or am I looking at it?
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Old 07-20-2003, 12:13 PM   #2
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Brett,
Never seen this set-up, but how about this:
Instead of the relay being the boost relay for starting, it opens only with ignition on or running motor to charge the coach batteries.
You could test it:
no 110V, disconnected coach batteries,igniton off:
no interior lights
igniton on or motor running:
interior lights???
If that holds true, it would be in a sense a battery isolator.
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Old 07-20-2003, 01:56 PM   #3
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Also FYI Battery Isolator at Pep Boys or similiar parts places are under 40 bucks, if you need to install one.
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Old 07-20-2003, 07:16 PM   #4
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that is not a isolator. a isolator would have two big diodes to block current flow from the batteries toward the altenator. i see a solenoid and three fuses. lol
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Old 07-20-2003, 07:23 PM   #5
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I am going to have to get out my meter and trusty helper.

I think the relay connects to the selinoid, and the relay is fed voltage at start so all of the batteries are connected when I hit the key. This would explain why the coach starts so easy every time.

Only tests will tell as the Service manual and Owners manual say nothing on this.
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Old 07-21-2003, 07:29 PM   #6
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on the rear of my battery box i have two solenoids and that is for the boost but my boost has ben disabled. the relay was behind the altenator. i havent figured out why one battery wouldnt start the 454, as all other 454s i have owned only required one battery. if that is the bost control solenoid a wire should go to the solenoid on the rear of the battery box or where ever the boost solenoid is located. dont understand why three fuses?? when you finger it out let us know.. lol
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Old 07-21-2003, 09:58 PM   #7
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My guess....

Since we are just guessing here....

I would think the relay solenoid is used to place your house batteries and your vehicle battery in parrallel when your engine is running to charge your house batteries.

I bet, that it is not enabled during the actual crankng or starting of the engine. That wire and fuse is not big enough to help start the engine and would promptly fry if the engine battery is missing or bad.

So, I bet it is only on when the engine is running for charging. It actually works better than a diode isolator since you get a full charge w/o the voltage drop a diode gives.

That is how I wire my service vehicles whenever I set them up with an aux battery.
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Old 07-21-2003, 09:58 PM   #8
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The three big fuses are labled Auto battery, coach battery and a ground. The ground is over the selinoid.

The other fuses on the right are the standard circuit fuses for the coach accessories.

I have not tryed to figure this out yet, I pulled the stove to transfer to the 76 tonight, so maybe tommrow.
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