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Old 09-17-2018, 06:00 PM   #1
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2005 25' Safari
Pittsboro , North Carolina
Join Date: Mar 2018
Posts: 3
bonding ground & neutral

I purchased a Firman generator which runs and starts easly. When connected to the EMS I get error code E-9 . I think it has to do with ground. How can I fix this. Firman seems to be no help.

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Old 09-22-2018, 05:21 PM   #2
Rivet Master
2015 30' Classic
Pleasanton , California
Join Date: Jan 2015
Posts: 727
You need a ground-neutral bond. Here's a link to show you how to make this plug.

Al, K6IV
2015 30' Classic, "Chez Nu"
2014 RAM 2500 w/Cummins Diesel
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Old 09-22-2018, 07:21 PM   #3
Half a Rivet Short
2017 30' Classic
Carlisle , Pennsylvania
Join Date: May 2017
Posts: 6,261

When feeding an RV you need to bond the neutral to the ground at the source ( = the generator). You also *should* do something to connect the ground to a "real ground". A spike in the ground is one way to do this, there are other possibilities.

If the generator is feeding a house through the breaker panel, this ground bond is not needed (= don't do it).

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Old 09-22-2018, 07:48 PM   #4
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Dadeville , Alabama
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You can make yourself a homemade 30 amp Dogbone for your generator with a 30 amp plug, single gang box, cover, and a short 10ga pigtail with a 20amp plug
Wire the 30amp plug just like normal but add a short jumper wire between the ground and the neutral. This will bond the neutral outside the trailer and at the power source like it is inside the panel box/shore power supply.
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Old 09-22-2018, 09:34 PM   #5
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Tampa , Florida
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The simplest is to make a cheater plug.
Take a plain old three prong male plug,
Run a jumper wire from the green ground to the white (silver) neutral.
Then while on generator, just plug that into any unused 120v. outlet on the generator.
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