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Old 09-24-2013, 07:59 PM   #1
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Odd electrical ground / neutral issue on '89 370 classic

so if anyone remembers I redid my breaker box earlier due to someone making a mess out of it http://www.airforums.com/forums/f37/...ly-108627.html ...anyway its been doing great sitting in the yard so I thought id tackle adding a switch and second 20 amp cord to the front air unit so I can run it without the gen having to be on(2 way switch one position for shore power and the other for gen power)
long story short I had power on the MH running whilst fidgeting with the connections in the gen housing going into the coach. I identified the main feed and the ac feed going in and tested them for live ckt and it was all dead so I proceeded to disconnect the wires. I unhooked the hot(black) wires no big deal but when I unhooked the neutral(white) wires something odd happened...the main neutral went fine unhooking but the ac neutral gave me a slight shock and the rear ac quit and I heard the switchover relay in the inverter click every now and then like it did before I ran the proper sized wires from the house breaker to shore cord. it seems there's something going on with the front air neutral and the rest of the coaches system. I made sure to separate all the grounds and neutrals in the breaker box but I did notice while doing the rewire that the ground and neutral on the inverter wires seemed to be connected...is this normal? what should I look for?...ok long short story over...lol
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Old 09-24-2013, 08:04 PM   #2
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Old 09-24-2013, 08:18 PM   #3
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I think you need to look for an electrician...
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Old 09-24-2013, 08:31 PM   #4
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perhaps you're right but I'm a die hard(and possibly some day died hard) do it yourselfer...lol
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Old 09-24-2013, 08:57 PM   #5
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perhaps you're right but I'm a die hard(and possibly some day died hard) do it yourselfer...lol
Possibly from an electrically hot airstream.
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Old 09-24-2013, 09:49 PM   #6
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It's been a long tome since I rewired my SOB but (if I remember right) the transfer switch does not switch the neutral and in effect you have an open neutral and are running the ac on hot and ground.

I rewired the rear not the front so it may not be the same but I did have to switch both neutral and hot because of the way the generator tied into the main box.

I just looked at your rewire post I hope you have "not" tied the neutral wire to the ground wire in the breaker box as this would be a big time no no..
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Old 09-24-2013, 11:55 PM   #7
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Okay I have read this 3 times trying to see what you have done and if I read it right you ran a second line to the ac from a switch? Think logic or gate 2 lines in 1 line out switch only determines which input to use. so line from generator or where ever it came from in the begining is input 1 switch position 1 and ac line from house is input 2 or switch position 2. never share inputs hot or neutral and you should be fine as long as you wired the ac in the AS correctly which I am assuming you did. S quick check at the ac to make certain that the hot is the ac hot (air conditioner) not talking down cause I have been in wireing for 20 years and still on a rare occassion arch a screw driver or 2.
Cliff and I hope this helps
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Old 09-25-2013, 07:29 AM   #8
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Okay I have read this 3 times trying to see what you have done and if I read it right you ran a second line to the ac from a switch? Think logic or gate 2 lines in 1 line out switch only determines which input to use. so line from generator or where ever it came from in the begining is input 1 switch position 1 and ac line from house is input 2 or switch position 2. never share inputs hot or neutral and you should be fine as long as you wired the ac in the AS correctly which I am assuming you did. S quick check at the ac to make certain that the hot is the ac hot (air conditioner) not talking down cause I have been in wireing for 20 years and still on a rare occassion arch a screw driver or 2.
Cliff and I hope this helps
The switch isn't wired yet till I figure out why the whole system will only run satisfactory with neutral hooked up to the front ac input line in the gen housing. but the idea of the switch is a SPDT with the input leg going to the front ac hot wire and the other legs one going to a shore connector and the other going to the gen output.
On the neutral issue I've been thinking about the switchover relay in the panel box maybe I have dirty contacts on the neutral side...ill look into that(not on a live circuit folks) when I get home today. This may have something to do with the G/N bonding I noticed. If I'm not mistaken shouldn't the ground and neutral be totally isolated?
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Old 09-25-2013, 04:00 PM   #9
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Yes ground and neutral are always separate but sounds like you are doing great.
Cliff
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Old 09-25-2013, 08:05 PM   #10
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too tired today to tackle the lectric problem plus it was threatening to rain so ill give it a whirl tomorrow.on a related note I was able to power the front ac using an external cord so I know it works now.
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Old 09-26-2013, 09:51 AM   #11
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another question IIRC the neutral coming directly from the generator has continuity to the chassis of the MH. should the neutral and ground in the generator not be bonded?
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Old 09-26-2013, 05:45 PM   #12
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WOOT!! I found the problem with the neutral acting the fool.... seems I was right in checking the gen switchover relay...the neutral side has lost continuity from feed leg to the other terminals...looked closer and the little braided wire was burnt in two....there's my loss of neutral so its off to find a new relay. but I still have a bonding issue I've traced to the output on the inverter(trace u2512) and the generator(onan emerald 3).
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Old 09-28-2013, 01:38 PM   #13
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starting to talk to myself now it seems but I'm just sharing my findings. still waiting on the relay but in the mean time I've researched the bonding issue and it seems its supposed to be that way so all is normal with the inverter and generator having the neutral/ground bonded.
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Old 09-28-2013, 05:51 PM   #14
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Excellent!!!! Congrats!
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