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Old 06-25-2003, 12:00 PM   #1
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front Coleman a/c unit

Just before the crash, I asked this question and didn't get to try the the posted answers before they were lost....

The front a/c on my 84 310 motorhome will not run on genset power, shorepower only....according to my manuals the rear unit should operate on genset power only but the front should work on both...I cannot see where the p.o. changed any wiring but that is not a strength of mine...help me out again..thnks, jem
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Old 06-25-2003, 04:05 PM   #2
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Do you have a selector switch? My 345 has a switch above the stove that allows me to direct the power to 1. Front AC, 2. Rear AC, 3. Microwave, and some others. THe rear AC is automatic with the gen set.

Of course my AC's dont' work well.
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Old 06-25-2003, 05:39 PM   #3
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i have a 310 . did you check the two circuit breakers on the generator??? does the rear ac work on the generator?? ill be loking for your reply.lol
al
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Old 06-25-2003, 09:02 PM   #4
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Fred.... My unit has a roadside switch for a/c or micro only.

Al...checked all breakers and fuses I could find, all aok, in lost post you mentioned some breakers on roadside rear under or around bed, I found one set ...are there more? That was where I wished I could look again at your previous detailed post...jem
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Old 06-25-2003, 09:04 PM   #5
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Al..yes the rear a/c works on the genset...thanks for any advice...jem
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Old 06-25-2003, 11:25 PM   #6
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did you check the circuit breakers on the generator??? it has two circuit breakers and the 30 amp likes to trip.
al
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Old 06-27-2003, 07:36 PM   #7
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Al.... spent a good while today setting and checking the breakers in the coach and on the genset and they "appear" ok.....no luck....how would you check or isolate a braker that had failed...switch them around?....jem
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Old 06-28-2003, 08:37 AM   #8
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The best way to check a breaker is to remove the cover of the box, 2 to 4 screws, and test for power on the output side of the breaker. Black lead from the meter goes to the bus with the white wires, red lead goes to the screw on the breaker itself. Do not pull too hard on the breaker itself as the breaker usally is not held in by anything other that the cover you just removed. If you pull it can pop out

I would flip each on off and on with the meter probe on the output screw and see if it works as it should. as breakers get old they will cometimes fail, or get weak. If this is the problem take to bad one with you to HD or Lowes and you can get a new one for less than 10 bucks.
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Old 06-28-2003, 10:02 PM   #9
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Electrical tracing is not my strenghth but got some knowledgeable help today and discovered that everything checks out ok at breakers, they work.

I realized I had no 120v power anywhere in outlets in front half of the coach when shorepower was unplugged in the testing process so looked in every nook and cranny and found the breaker for the back a/c unit, it was under road side bed and was a single breaker in one box which would cut rear a/c power only.

I guess those 15,20, 30 and main under the bed rear need more investigation? They are hot with shore power but not thru genset....jem
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Old 06-29-2003, 03:48 PM   #10
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ok how do you check the breakers.the breaker box under the bed take the cover of and you will see a three conductor romex wire coming out of the box that goes to the rear of the coach. unscrew the wire nut on the black wire this will have 110 vac when the gen set is running . you will have a white and a ground wire connected to the neutral buss if no 110 ac is found on the black wire the 30 amp breaker is bad on the gen set. measure with meter to black wire and white wire coming from gen set.
al
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