Here is a link to the adapter plug https://amzn.to/30FVXiz
Here is a link to a multimeter https://amzn.to/2Gvj88o
If you have a Zamp solar plug on your RV and you want to use a different brand than Zamp you can use an adapter. This video will show you how to use the adapter and how to figure out if you need on or not. Enjoy.
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