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Old 05-16-2015, 01:31 PM   #1
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AC Electrical Issue

I received my new Penguin AC to install in the front. Now... for some reason, I am only getting 90 volts to the AC. I checked the breaker and even replaced it and also cleaned off all contact points, but still only get 90 volts. The AC needs at least 120. The rest of the coach is getting 120. Does anyone have any insight on what could be wrong?
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Old 05-16-2015, 02:30 PM   #2
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???

wrong wire size (just a guess)

Jim
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Old 05-16-2015, 03:51 PM   #3
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Thanks Jim.... but not the right answer. Wire is 12-3 more than enough to run the AC. I also checked all connectors and they are good. The weird thing is it puts out 90 volts at the AC. What could cause a 30 volt drop from the breaker box to the forward AC?
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Old 05-16-2015, 04:04 PM   #4
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Quote:
Originally Posted by MO Fred View Post
Thanks Jim.... but not the right answer. Wire is 12-3 more than enough to run the AC. I also checked all connectors and they are good. The weird thing is it puts out 90 volts at the AC. What could cause a 30 volt drop from the breaker box to the forward AC?
got to be a high resistance connection somewhere. Try disconnecting power and check the resistance of the wire with an ohm meter.On one end of the cable tie the black and white wires together and at the other end breaker? put one lead of your meter on each wire. should not see any significant resitance. could there be a junction box somewhere?
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Old 05-16-2015, 04:06 PM   #5
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Thanks Jim.... but not the right answer. Wire is 12-3 more than enough to run the AC. I also checked all connectors and they are good. The weird thing is it puts out 90 volts at the AC. What could cause a 30 volt drop from the breaker box to the forward AC?
Im assuming when you say 12-3 wire that one wire is a bare copper ground wire.also assuming 90volts with no load.
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Old 05-16-2015, 04:17 PM   #6
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Assuming you do not have a load on the line I would guess open neutral... Put a socket on it and connect a 60-100 Watt incandescent bulb and see what happens. They do not get as bright but are not hurt by using them as a load. Measure the voltage from both sides to the safety ground under load. Should be 120 and zero. The load accounts for stray coupling of the AC.
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Old 05-17-2015, 10:07 AM   #7
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Simple steps...

Locate an extension cord and plug it into any outlet on same phase or side.

If 30 amp coach any should work.

Now measure like to like voltage from cord to ac.

Measure from small lug to black, large lug to white and ground to shiny metal of ac.

When you see a difference that conductor has the issue then troubleshoot just that.

When issue is found and corrected assume same person did it again and look for similar work...

Suspect a loose connection at breaker or bad breaker to maybe a loose wire nut.

Do not just start wiggling things as an intermittent can be fixed this way to fail at a bad time later.

Get a voltmeter and snesk up on it.

Also a 30 volt drop on an unloaded wire is real bad...but should be real easy to locate.

Test with light bulb as a load as indicated above and do not use ac until you think it is fixed.
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