M2-ATX works on test bench but not in car (voltage drop caused by M2-ATX)
I have a very strange problem, when I am using my M2-ATX connected to the 12V rail on my normal PSU it works, but if I connect it to my car it doesn't work at all.
I have tested with a multi meter and before I connect the M2-ATX it is at 12.4V but as soon as I connect the M2-ATX it drops to about 2.6V!
An amp and sub are also connected which work perfectly when the M2-ATX isn't connected, I've also tried it with only the M2-ATX connect and still drops the voltage.
A 4 gauge wire goes into a distribution block with 8 gauge wires going to the pc, amp and sub, it has been like this for about a year with no issues when last week it just stopped working.