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Thanks for your replies. I'm pretty sure the DMM is accurate as I can see the voltage in my videos and it corresponds to what I see on the DMM. Also I had the PMP before I replaced the car battery and the DMM helped me identify the battery needed replacement (it was approx 6 years old). If...

At the point where the cable connects to the PMP box (via the plastic connector - I unplug it to measure). Should I be measuring it elsewhere?

I have a new 3 month old battery and my PMP was working fine set to 12v for the first month of its use. After a month, it kept cutting out as if the voltage dropped under 12v. I tested several times with a multimeter and it was consistently over 12.3v while ignition was off and car parked...

I had to create an account here because whoever runs this store is ignoring my requests for an RMA. I've sent in requests via your website and email numerous times over the past month and have been ignored. Huge warning to anybody that is going to order from this site.