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I picked up a new flasher unit at the Aberdeen show...unfortunately I can't remember who I bought it from. Put it on my M37 and when i moved the signal arm the circuit breaker immediately tripped it did this three times. (Put it on the M35A2 and it fried the jumper wire I used to ground it...Obviously unit is faulty.

The only reason I needed a new unit was I had taken the one off my M37 to put on a friends M35A2 whose unit had failed.

I am assuming it is a Newstar unit as it has NSN and part number but unlike all the original ones it doesn't show a manufacturer. (My old one was Swiss controls)

Looking around most of the ones you see new are also probably from Newstar so I wonder if this was a one off failure or is there an issue with many of their flasher units. I noted that the terminals were not marked in the rubber inset as the original units were.

Mine works fine. (And on 12v to boot)

If you deal with a lot of these; you will soon establish the fact that they are not great, track record for NOS and New Star units reflect that clearly. The best fix is to simply go to NAPA or your preferred parts outlet and purchase a good name brand 24-volt, (or 12-volt if your system has been converted) 2-prong electronic flasher such as a Signal-Stat brand. Remove the flasher cannon plug connector from the wiring harness, install correct terminals on wire "A" and wire "B" and plug them onto the flasher terminals. These flashers will outlast the New Star or the original mil spec flashers MANY times over; in fact we have installed many in this manner and never had a complaint of failure to date that I can recall.