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Old 07-29-2020, 02:40 AM   #1
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Brand: Thor Motor Coach
State: New York
Posts: 2
THOR #19852
"Open Ground" outlet issue?

2003 Four Winds Hurricane - test plug is showing all outlets with an "open ground" while on shoreline power. But, when switched to the generator power all outlets are "correct". Then, when back to shoreline, "open ground" again. So I went to the breaker panel with my meter. While on shoreline power, testing from hot to neutral is 120v, but from hot to ground is 60v. However, when on generator power, hot to neutral is 120v and hot to ground is also 120v. Is this normal (ie; ok?). I'm wondering if this has to do with the transfer switch set-up? It's obvious a ground exists for either power source, since I'm getting a reading from hot to ground on my meter... but why only 60v when on shoreline power, and 120v while on generator? Help!
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Old 07-29-2020, 03:33 AM   #2
gmc
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Brand: Thor Motor Coach
Model: Hurricane 32A
State: Florida
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THOR #2829
Quote:
Originally Posted by Tuttle59 View Post
2003 Four Winds Hurricane - test plug is showing all outlets with an "open ground" while on shoreline power. But, when switched to the generator power all outlets are "correct". Then, when back to shoreline, "open ground" again. So I went to the breaker panel with my meter. While on shoreline power, testing from hot to neutral is 120v, but from hot to ground is 60v. However, when on generator power, hot to neutral is 120v and hot to ground is also 120v. Is this normal (ie; ok?). I'm wondering if this has to do with the transfer switch set-up? It's obvious a ground exists for either power source, since I'm getting a reading from hot to ground on my meter... but why only 60v when on shoreline power, and 120v while on generator? Help!

Not normal...
The RV panel does not have bonded neutral to ground. It is considered a sub-panel. The generator provides bonded neutral to ground as does shore power.
I’d start at power pedestal and verify 120 from hot to ground.
From there check power cord, RV receptacle, and transfer switch looking for loose ground connection.
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Old 07-29-2020, 10:18 AM   #3
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Brand: Keystone
Model: Sprinter
State: Florida
Posts: 1,287
THOR #15553
Quote:
Originally Posted by Tuttle59 View Post
2003 Four Winds Hurricane - test plug is showing all outlets with an "open ground" while on shoreline power. But, when switched to the generator power all outlets are "correct". Then, when back to shoreline, "open ground" again. So I went to the breaker panel with my meter. While on shoreline power, testing from hot to neutral is 120v, but from hot to ground is 60v. However, when on generator power, hot to neutral is 120v and hot to ground is also 120v. Is this normal (ie; ok?). I'm wondering if this has to do with the transfer switch set-up? It's obvious a ground exists for either power source, since I'm getting a reading from hot to ground on my meter... but why only 60v when on shoreline power, and 120v while on generator? Help!
Assuming you are on a campground PED. The problem is with in the shore line pedestal. Unplug the RV at the RV connection and check the voltage at the end of the cord. then unplug the cord at the ped and check the voltage. The fact that it works correctly on The gen proves your rig is ok. Get the park to have it fix immediately. If at home call an electrician.
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Old 07-29-2020, 12:30 PM   #4
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Brand: Thor Motor Coach
State: New York
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THOR #19852
Thumbs up Problem Solved!

Thank you all for your helpful responses. The issue has been found and corrected. On the female end of my shoreline, the ground was missing one side of the two contacts. (Must have fatigued and broken off over time.) So when I tested my shoreline with the meter, everything was appearing fine because the probe was still making contact, but when plugged into the camper, it wasn't "sandwiching" the male-side ground prong, thus creating a bad ground (connection was too loose).
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