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Old 07-22-2015, 07:53 AM   #15
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In my opinion--your last post suggests you are not on board with the likely root causes being provided by this thread. My early 03 [late o2] Alpine has/had the inverter on a shelf in the small compartment just in front of the passenger side rear wheel well. The echo charge is a relatively small electronic device on the ceiling, near the inverter. Point is--its not comparable with a typical bat charger--very modest rate of charge. On the road, your battery isolator routes charge from the alternator to the bat banks. While on shore power or genny--the inverter provides the charge to house bats. The echo charger has little if any impact on the bat while driving; while on shore power, it transfers a modest amount of charge from the house to the chassis bat based on the the house bats being at a high state of charge. Again, think you should focus on the alternator, the battery isolator, and your battery banks [bats and connections].....
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Old 07-22-2015, 03:59 PM   #16
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I thought that the 04's only have a solenoid, operated by the vansco system , instead of a true battery isolator. Is the alternator connected through this solenoid, or directly to the chassis battery bank?
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Old 07-22-2015, 09:14 PM   #17
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Packetx--yup--by 2004, think Alpine had gone to all Vansco systems, so you are looking at light 19 on the Vancso and continuity across the solenoid. If those check out and bats are still not charging, it probably point back to the alternator--my bad.
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Old 07-25-2015, 03:24 PM   #18
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It was the alternator after all. It took the mechanic two hours to troubleshoot and install the alternator. I now have 14.3 Volts. Thank you for all your help.
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Old 07-26-2015, 07:40 AM   #19
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If you are ever in the Concord New Hampshire area and need a roadside mechanic, I highly recommend John's Wrecker Service in Concord. Ask for Bob, he is very a skilled and knowledgeable mechanic. He also provided the attached technical data on the "Duvac" system which may help you diagnose any alternator problems.
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File Type: pdf TSB_704.pdf (107.5 KB, 33 views)
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