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Old 10-02-2011, 03:52 PM   #1
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Itasca Impulse -blown fuse to converter

I have 2007 Itasca Impulse. Both 30 amp fuses (both related to the converter) blow the second I turn on the house battery switch. The converter as a result does not charge the batteries. Digital meter shows that the load side of both fuses is shorted directly to ground. What is causing the short? The fuses are located near the top of the distribution panel. By the way, where is the converter located -- couldn't find it on the wiring schematics?
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Old 10-03-2011, 09:04 AM   #2
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If I remember correctly those fuses are for the battery directly. Start with the battery connections and work your way to the converter. Has anyone changed anything at the battery recently?
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Old 10-03-2011, 06:14 PM   #3
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Smile I will give it a try

I will start with the battery and work my way from there. Seems funny that one side of both fuses would be shorted directly to ground but the batteries are good when charged by the engine. Thanks for the suggestion.
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Old 10-03-2011, 08:45 PM   #4
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I could be way off here but it looks like you have a Parallax (Magnetek) 7300 Series Power Center Converter. If so, then the two 30 amp fuses are reverse polarity protection fuses.
If you do have the Parallax (Magnetek) 7300 Series Power Center Converter:
Here is the Troubleshooting manual: http://www.parallaxpower.com/7300/Flowchart7300.pdf

Here is the installation manual: http://www.parallaxpower.com/7300/73...%20Rev%20B.pdf

Dave
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Old 10-04-2011, 08:46 AM   #5
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Thanks, Dave, for the info. I will take a look and see what I find.
Tim -- also in Virginia.
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Old 10-04-2011, 11:14 AM   #6
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Ahh, I work around the corner in Manassas, live in Strasburg.

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Old 10-04-2011, 04:17 PM   #7
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Dave -- We are in Heritage Hunt, Gainesville. You probably pass by us every day on the way to work. The info looks like what I need. Rig is parked at Manassas Fairgrounds but I won't have a chance to finish checking out this problem until Saturday. Tim
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Old 10-04-2011, 06:33 PM   #8
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Good luck & let us know what you find - Dave
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Old 03-30-2013, 02:12 PM   #9
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I am having trouble with my Parallax 7345 converter blowing 30 amp reverse polarity fuses.
I installed new batts. But reversed the polarity. Corrected my mistake.
But fuses still blow when on turn on disconnect switch at the door.
With fuses out I do get 12V in coach. Charging batts with car charger right now.
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Old 03-31-2013, 10:00 AM   #10
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I was having the same problem. My only solution was changing out the convertor. Although it is a little expensive, I couldn't find another solution. I ordered it from Amazon, installed it the next day, fixed the problem. I haven't had any problems since but I have my fingers crossed. Good luck.
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Old 03-31-2013, 11:28 AM   #11
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Going to order a Progressive Dynamitic 4645 today.
Best Converter has a cheaper price than Amazon.

Did you have any problem making the change over? Wires on DC board?
I see on my Parallax they are not lug screwed on.
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Old 03-31-2013, 11:51 AM   #12
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These links should answer most of your questions:
Upgrade or Replacement RV Converter/Charger with built-in CHARGE WIZARD
http://www.progressivedyn.com/pdfs/4...tion_guide.pdf

RV CONVERTER/CHARGER REPLACEMENT

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Old 03-31-2013, 12:05 PM   #13
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Thanks Dave.
I have looked at this before.
Have been searching all my options. Hope this works.
I am kind of like Tim the Tool Man. Whatever can go wrong usually does.

And I used to work on big $$ tablet presses for a living.
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Old 03-31-2013, 08:01 PM   #14
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I meant to ask, did you try the troubleshooting procedure in post #4 above?

Dave
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