O.K. I am still unclear on what exactly is going on.
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quote:Originally posted by jsrang
The SG is where it should be on the battery, which is only about 3 years old.
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Excuse my ignorance, but what is a "SG"?
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When I fitst unplug, it works fine on propane for a couple hours at least, and plugged in to the TV.
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I am having trouble understanding this statement. I think you mean once you unplug (from either shore power or the TV) it works for a few hours and then quits cooling. Correct?
Similarly, if plugged into the TV or shore power, the refer works fine. Correct?
When the refer quits cooling are there any lights or displays on the control panel?
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Is this the 40A fuse in the TV that you are referring to, or a different one? And where would I find it?
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I don't know what size fuse Chevy uses (my Fords have been either 30 or 20 amp fuses) nor where it is located exactly. It is located in the fuse box under the hood and not in the fuse box under the dash. The manual should identify it as a 12V RV Line (or something similar). You can test if it is working by checking the voltage on the 12V Charge Line pin on your 7 pin plug. Looking at the tv's plug, the 12V one is at 1 o'clock relative to the notch. I believe Chevy's and Dodges leave the circuit hot even when the ignition key is off.
I am assuming the problem is the refer works fine on propane *IF* plugged into shore power (120V AC) *OR* plugged into the TV.
Conversely, the refer on propane will work for a short period on 12V battery power only (4 hours or so) and then it quits.
The refer always needs 12V (for the circuit board) even if running on 120V AC. The converter and the TV both supply 12V to the battery and make it appear as the battery is supplying the voltage (even if it is completely discharged) to the rest of the coach.
Given all the above assumption and guesses, it must be the battery. The drain due to the refer, along with the normal parasitic drains, sucks the life out of the battery in a few hours. While the battery may show 12.4 +/- volts, a load test will show it has no capacity.
When the refer quits, do the all the 12V light quit too? If they work and the refer doesn't then the cause is beyond me.