I have one of these for a different purpose, they are an okay brand but some things it worked on and others it would not. Example camping fridge worked fine, mattress inflator no go. Could be you just had a faulty unit, take it back under warranty. Just a couple of points to note.
1. The mount only required 4.0 amps so the supply should be adequate.
2. What happened to you last powers supply? Why and how did it fail.
Asking number 2 because have you considered you have a mount issue?
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