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Old 10-19-2017, 05:33 PM   #1
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Question: Reversed Polarity?

Need some help on project. Took awhile and had to build my own test adapters, but finally I located the Reversed Polarity problem in a replacement plug on the shore line. Who ever did this was lucky that they didnt get hurt. SO now I am turning my attention to the genny which the cowl was remove. My question and suspicion is that the invert sensed the reversed polarity and would not let the remote switch start the genny. A lot of IFs but if anyone has the experience I would appreciate a reply. Thanks
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Old 10-19-2017, 05:50 PM   #2
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Doubt if your genset is that "smart"......Hard to assess the harm to all the appliances and electrical equipment [both AC and DC]....that may have occurred as a result of being exposed to 120v AC on the ground/neutral side.....
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Old 10-19-2017, 06:00 PM   #3
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RE: Reversed Polarity

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Originally Posted by Old Scout View Post
Doubt if your genset is that "smart"......Hard to assess the harm to all the appliances and electrical equipment [both AC and DC]....that may have occurred as a result of being exposed to 120v AC on the ground/neutral side.....
Hello from Guadalupe County! actually it was hot/neutral reversed... luckily. Its a Generac Impact 36 Plus II. Thanks for the reply!

PS next is to identify the inverter.
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Old 10-20-2017, 07:28 AM   #4
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Seems like swapping a hot and neutral should have tripped the supply breaker since you're grounding out the hot leg.

Is this a 30 or 50 amp RV? If it's a 50 amp RV then swapping a hot and neutral leg would feed 240 volts to some of the 120v loads, not good.
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Old 10-20-2017, 07:50 AM   #5
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Need more information on the generator. Switching the hot and neutral is not likely to damage a device. It is not DC. The neutral and ground are apparently not connected together in your setup or it would have blown the shore breaker instantly.

If your generator has a remote start that control would be DC. It could be as simple as supplying a ground to the start section.

You do need charged batteries of course so always check your battery status before troubleshooting.
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Old 10-20-2017, 11:15 AM   #6
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Originally Posted by 70ChevelleSS View Post
Seems like swapping a hot and neutral should have tripped the supply breaker since you're grounding out the hot leg.

Is this a 30 or 50 amp RV? If it's a 50 amp RV then swapping a hot and neutral leg would feed 240 volts to some of the 120v loads, not good.
It is a thirty amp converter (pics in Vintage RV forum, thread "Restore -1978-Itasca"). Sure glad I didn't try the 50 amp adapter.
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Old 10-20-2017, 11:26 AM   #7
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Reversed Polarity corrected

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Originally Posted by YC1 View Post
Need more information on the generator. Switching the hot and neutral is not likely to damage a device. It is not DC. The neutral and ground are apparently not connected together in your setup or it would have blown the shore breaker instantly.

If your generator has a remote start that control would be DC. It could be as simple as supplying a ground to the start section.

You do need charged batteries of course so always check your battery status before troubleshooting.
At this point, all I know for certain is I corrected the polarity at the shore cable male plug.

It is a Generac Impact 36 plus II, someone has opened it up (removed the cowl). The remote switch inside started working after a couple of attempts. Apparently the fuel line has been broken or disconnected. I can only guess why? Maybe a bench repair. I will post pictures soon
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