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01-03-2010, 05:46 PM
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#1
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Moderator Emeritus
Join Date: Jul 2009
Location: South Carolina
Posts: 2,040
SUN #897
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Power post voltage and polarity checker
I thought JohnB had sent me a pic of one of these one time, but I guess I saw it somewhere else. I finally got the parts together today and fabbed one up myself.
I took a short 120v power splitter and put a 30A RV plug end on it. The plug cost me ~$8 at Lowes and the cord/splitter was sitting in the garage already.
Once I had the RV end on it, I plugged the voltmeter and polarity tester into the other end. Now, we can test voltage and polarity at a CG, before we risk damaging anything in our rig. Nothing special and very DIY. To me, it sure beats finding out about problems AFTER plugging the rig in!
EDIT: The inside of the plug is clearly marked, as to which wire goes on which terminal. Pretty much Gary-proof!
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01-03-2010, 07:44 PM
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#2
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Moderator
Join Date: Nov 2006
Location: Ohio
Posts: 12,654
SUN #89
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Gary
And I like is comes with a bonded on really nice Mag light to find the power post in the dark and not plug into a bees nest.... Had one fly out at me last campout.....
Neat gizmo. Thanks for sharing.
John
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Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
Google Custom Search For Sunline Owners Club
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01-03-2010, 08:33 PM
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#3
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Senior Member
Join Date: Sep 2006
Location: Pennsylvania
Posts: 545
SUN #67
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Gary
I have a volt meter plugged in next to the stove all the time. That way I can see what's going on with the power all the time. You would be surprised how much voltage fluctuates during the day in some campgrounds. There are times I have to shut off the electric water heater to bring the voltage back into the green. Also nice on really hot days for watching voltage while running the A/C.
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Mike & Roz
2018 Grand Design 315RLTS
2023 Ford F-350 Lariat PSD/CC/LB/FX4
Sunlines= '06-2075, '06-264SR
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01-04-2010, 04:04 AM
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#4
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Moderator Emeritus
Join Date: Jul 2009
Location: South Carolina
Posts: 2,040
SUN #897
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Quote:
Originally Posted by 264SRinPA
Gary
I have a volt meter plugged in next to the stove all the time. That way I can see what's going on with the power all the time. You would be surprised how much voltage fluctuates during the day in some campgrounds. There are times I have to shut off the electric water heater to bring the voltage back into the green. Also nice on really hot days for watching voltage while running the A/C.
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It's also amazing, how much a 1500w heater affects the voltage.. We have two of those voltage meters and one will stay in the camper..
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01-15-2010, 08:58 PM
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#5
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Senior Member
Join Date: Jan 2009
Location: Rhode Island
Posts: 1,515
SUN #768
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I like that test setup Gary. I always had the test light in the trailer but then I heard about someone that fried some equipment because the polarity was wrong at the post so it made me think it was much better to test at the post before plugging in the trailer. I was in Home Depot today ( sorry Kitty) and saw a 30amp to 20 amp adapter. ... it didn't have a maglight with it but I bought it anyway.
Connecticut Electric 20 Amp to 30 Amp RV Adapter
Model # AD2030
Store SKU # 157113
$6.97/EA-Each
Gene
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Gene & DW Ginny
2002 Sunline T-2363
2008 Toyota 4-runner 4wd 4.7L V-8
Reese Dual Cam straightline - P3 Brake controller
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11-03-2010, 08:07 PM
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#6
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Junior Member
Join Date: Nov 2010
Posts: 1
SUN #1673
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Quote:
Originally Posted by EMD_Driver
I thought JohnB had sent me a pic of one of these one time, but I guess I saw it somewhere else. I finally got the parts together today and fabbed one up myself.
I took a short 120v power splitter and put a 30A RV plug end on it. The plug cost me ~$8 at Lowes and the cord/splitter was sitting in the garage already.
Once I had the RV end on it, I plugged the voltmeter and polarity tester into the other end. Now, we can test voltage and polarity at a CG, before we risk damaging anything in our rig. Nothing special and very DIY. To me, it sure beats finding out about problems AFTER plugging the rig in!
EDIT: The inside of the plug is clearly marked, as to which wire goes on which terminal. Pretty much Gary-proof!
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Since you poblished this modification, I have looke all over the internet, Radio Shack, Lowes, Home Depot, etc. to find the plug-in voltmeter shown on the photo. Could you please help me find one. AND, can you make one of these for a 40 amp plug?
Thanks for your help!
Udo Winkler
Running Springs, CA
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11-03-2010, 08:15 PM
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#7
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Senior Member
Join Date: Jan 2009
Location: Rhode Island
Posts: 1,515
SUN #768
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Gene & DW Ginny
2002 Sunline T-2363
2008 Toyota 4-runner 4wd 4.7L V-8
Reese Dual Cam straightline - P3 Brake controller
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11-04-2010, 06:37 PM
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#8
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Moderator Emeritus
Join Date: Jul 2009
Location: South Carolina
Posts: 2,040
SUN #897
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One other thing.... Welcome to SOC!!
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