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Old 12-03-2016, 06:23 AM   #1
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Pheaton 40 QTH Electrical issues

I have a 2005 pheaton 40 QTH with a cat 350 in it. Started it up as usual this morning to get it ready to go south for the winter and encountered the following problem.
A) I have no power suppling the following items:
1) Windshield wipers 2) Back up camera 3) Left and right retractable windshield shades, 4) Left and right power and heated mirrors, 5) dash heat,A/C defrost unit.
Checked the fuses to all items listed above and all were in good and working condition. Checked grounds at the battery connections and even grounded out a couple of the items listed seperately. I feel it is some type or sort of relay or power connections somewhere in the coach but dont know where to start looking. Anybody else have this problem or any mechanics have any suggestions would be glad to talk to you ...
Thank you in advance
Regards, Stuart
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Old 12-03-2016, 06:33 AM   #2
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I don't have a wiring diagram for your coach, but all of those items I would think are powered from the chassis battery, thru the ignition switch and ignition-switched-in 12v. Like any automobile, some chassis items are supplied power all the time, and others get power only when the ignition is turned on. There's a relay that the ignition switch turns on.

Since your engine is running, I would suspect that the ignition switch is good (else the engine wouldn't have power to run), therefore I'd initially suspect the relay. Don't know where this is in your case, but I'd look first in the DS first bay under the driver.
DaveB, Raleigh, NC
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Old 12-03-2016, 08:13 AM   #3
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I agree with DaveB - it sounds like a stuck or defective relay that is activated by the ignition switch. I think on your year/model of Phaeton, the relay you are looking for might be the ones that are accessible by removing the two drawers in the center part of the dash. Give Tiffin Service a call on Monday and have them confirm what relay you are looking for and where it might be located. Have your VIN handy when you call.
Roger & Mary
2017 Winnebago Navion 24V (Sold)
2014 Tiffin Phaeton 36GH (Sold)
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Old 12-04-2016, 06:00 AM   #4
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I did find the problem. It was a blown 10 Amp iginition spade fuse located under the center console where the 2 drawers are located. After removing the 2 drawers i found another terminal/ fuse block, that is where the culprit was hiding !!!! thanks for your help/suggestions.
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electrical, heat

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