MSefi.com read only forum (Jan.15,2018)

On this URL is the info on how to test transistors with a multimeter.

http://www.electronics-radio.com/articl ... r-test.php

if nothing else is connected to the same wire, and the MS is connected directly from the battery (using a Relay), you need to check those transistors. One of them can be damaged.

What was causing my fuses to get blown, was that the metal screws that holds the transistors Q12 and Q9 were making contact with the heat sink, causing a short between the base of the transistors and the grounding of the heat sink.
So, I just replaced the metal screws with the nylon ones and my ...

Hi there!

I had the same issue last month, I discovered that the mica isullator was not isullating properly and was making a short beetween the transistor and the grounding.
Check your transistors and change the screws, use only the nylon ones...
Hope this can help you!

Regards!

Hugo Z.