IMHO, jfb has the solution, but you might want to Google Trik-L-Start online. Costs $50 and is easy to install in 15 minutes. It lets your engine batt receive a trickle charge from the aux batts (which are being charged by your converter whenever the rig is plugged in to shore power, but only as needed.) I had the very same problem, but now my rig can sit for weeks and then start right up. Hope this helps.
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'07 Itasca 35L/W22 FULL-TIMING
1000 Trails - VFW - 5 Yrs Army
"NOT ALL WHO WANDER ARE LOST"
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