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Old 02-19-2019, 05:12 AM   #1
Junior Member
 
Brand: Thor Motor Coach
Model: Axis 24.1
State: California
Posts: 23
THOR #14093
12 volt power issues

I am trying to install two 12V Maxxair MaxxFans in mine 2015 Axis 24.1 Both, existing vent openings are prewired for new fans. To test the new fan I have connected the wires at the front opening but nothing would work. I checked the voltage to see only 8.7V. I checked the home batteries and I had 13.7V there. So, I removed the cover at the other opening in the back of the coach and I had there healthy 13.3V. New fan worked just fine. Any suggestions why there is a drop in voltage between these two points? Where and what else I should check?
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Old 02-19-2019, 01:02 PM   #2
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Brand: Thor Motor Coach
Model: 2013 ACE 30.1
State: Alberta
Posts: 496
THOR #2631
Hi, I don't know your coach specifics but many times the power wiring for the fan openings comes from the nearest ceiling light fixture. You might have a poor wiring connection (for either ground or +12) where the fan wiring splices into its power source. One way to check that general theory might be to kill the ceiling lights fuse and see if your 8 volts also goes to zero.....at least then you know roughly the source (and fusing for your fan). The other way is open up the closest ceiling light fixture (likely have to remove it from the ceiling too) and see if there is a splice there with wire colors similar to the vent opening. You can verify the wiring is for the vent opening and also check the splicing for vent feed wires (or perhaps a hard ground to chassis is used up there) is good.
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Old 02-20-2019, 05:10 AM   #3
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Brand: Thor Motor Coach
Model: Axis 24.1
State: California
Posts: 23
THOR #14093
Hello Javelin,
I will check the fuse box for the light and also will take a close look at the ceiling light fixture which is mounted very closely to the vent's opening. Thank you for your help. I really appreciate that.
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Old 02-20-2019, 04:12 PM   #4
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Brand: Thor Motor Coach
Model: 2013 ACE 30.1
State: Alberta
Posts: 496
THOR #2631
The main reason to determine the fuse (and location) that powers the ceiling light closest to the front vent is that when you remove that fixture to see if in fact it has a splice feeding the 2 vent wires.....you don't accidently short the 12v and ground while checking things.

Better to remove the fuse first then open up and check if the vent wires feed from the light and if the splice connections are tight and good. This saves you having to replace the fuse if something shorts accidently during your examination.
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Old 02-20-2019, 07:50 PM   #5
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Brand: Thor Motor Coach
Model: Axis 24.1
State: California
Posts: 23
THOR #14093
I will absolutely follow your advice.Thank you so much.This is our first coach and I can clearly see now, how fresh I am on the subject. I am so glad I have found this forum. Since we purchased our Axis last November Thor Forum is my new "bible" I study everyday. Thanks again !!!
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12v, fan upgrade, voltage drop

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