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Old 07-09-2018, 07:05 AM   #15
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Update on the fan issue. Checked the fuses on the fans and all of them checked good with the meter. Checked the marked grounds wires running to the fan and got -68.5 ohm at all three fans. Tried chasing wires and some of these wires run into areas I do not know how to access so that was a dead end. Checked the coach up and down and could not find another fuse bank. Thanks again for all the help. may need to take it in
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Old 07-09-2018, 07:28 AM   #16
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I don't know what type chassis you have but I have a Freightliner 06 chassis on a 07 Itasca motorhome. In addition to the main 120v and 12v breakers and fuses in the electrical panel under the bed, there is a lot of 12v resettable breakers in the left front compartment forward of the wheel. Also some in the compartment with the inverter and power cord, and some in the left rear panel above the side radiator. Those are the KNOWN locations of fuses/CBs. You may have others.

Winnebago has wiring diagrams available online for just about all coaches, you might check with Gulfstream and see what they can provide.
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Old 07-09-2018, 10:55 AM   #17
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Quote:
Originally Posted by GulfStrMike View Post
Thanks again for all the help. may need to take it in

If the shop you take it to does not have the wiring plans or schematics they will spend a bunch of time trying to do their diagnosis as they learn your rig's wiring. At $100 per hour, electrical problems can get very spendy quickly.

To give yourself more time to solve it yourself, I would patch a new power cord and ground to each fan's wires from a nearby source as a temporary work around.

This would require some 16 gauge wire for about $10 and a few connectors. Also you would not have to wait while your rig is in the shop.

The hard part is to find a non-switched power wire nearby. Perhaps in a ceiling light fixture even if it is switched?

On my old rig, I have been able to find most of the wiring runs for the house functions in covered channels, cabinets, ceiling etc.

The chassis wiring is infinitely more difficult on a DP.
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Old 07-10-2018, 12:32 AM   #18
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Anything other than zero ohms on the ground wire could be the issue .

Have you checked the power wire to the fans using a KNOWN good ground for your voltmeter?

Does your coach have aluminum trusses for the roof ?
If it has aluminum trusses; try hooking a fresh ground to the trusses to see if you can get the fans operational.
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Old 07-10-2018, 01:25 AM   #19
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I agree with Skip426, you can also measure the VOLTAGE from the fan ground to a known ground.... Guessing it will measure about 12v! A fresh ground wire would be the fix.
A little corrosion on aluminum = a bad connection.
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Old 07-10-2018, 12:13 PM   #20
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All thanks for the info. I will try these ideas and see where it leads. the one fan in the rest room is the easiest for me to find good ground wires and power wires. It has a large bundle running it the upper right side of the coach. The other two may need to run wires from another area.
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