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All these transistors have three pins, the tab is a heatsink. And yes it is an NPN transistor. A TO220 packaging.
I actually used a 2n6388g to replace one on the glow plug card.
https://www.mouser.com/datasheet/2/308/2N6387-D-102357.pdf
Doesn't hurt to clean the card with some 99% isopropyl alcohol. Then clean the pins with a fiberglass pencil. How do the contacts look on the transistors?
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