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This may not suit all but, there is a very, very simple way to do this & it is the method I use...
I have a 'permanent' pigtail swinging off my battery, two ring connections bolted to the terminals with two Anderson 15A powerpole connectors on the other end of the pigtail.. one red, one black that connect together...
On the battery end of my 12v cable, I have another pair of Anderson 15A powerpole connectors, again one red, one black that similarly connect together.
In this configuration, unless I remove the pigtail I've attached to the battery or, connected the pigtail incorrectly it is pretty much impossible to connect your mount in reverse polarity.. I say pretty much because, it's astounding what humans are capable of stuffing up but, essentially, when the two powerpole are connected to each other (they slide together) I cannot see any way to then plug the 12v cable incorrectly to the pigtail because the plugs simply will not go into each other...
The only catch is to be absolutely certain that positive to positive & negative to negative all the way to the 12v pin connection... This is really very simple & all you need to do is double check that you fitted them correctly. Wiring can be either soldered or crimped in place... I crimped because my soldering sucks...
For me this is foolproof because, the only way that I would undo the battery pigtail is if the battery is completely dead & being replaced otherwise, the pigtail is never touched...
It doesn't matter that you can't distinguish the red anderson from the black under red light because you simply cannot connect the two sets of anderson plugs on your leads together except correctly...
This is the simplest solution I know of & involves little to no technical skills..
I did this because I was paranoid about frying my mounts... I've been using this setup for about 5 years now with zero problems & in my opinion pretty much zero risk of frying a mount due to incorrect polarity.
Hope this helps
Edit: Meant to add pictures, added now.. these are available at Jaycar
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