relay latching problem

There's nothing really cool about it, but this is the schematic. Like I said, the 2n2222 was causing probs for some reason, and replacing them with TIP120's worked like a charm.'86 Ford Ranger 545/C6/EFI

Ahh hell. Try again. '86 Ford Ranger 545/C6/EFI

Keep in mind it takes more current to turn on a relay than to maintain it once it's on. I'd guess you have a high side drive signal, which is either high or open circuit. If your driving signal doesn't drive to ground to cut off the transistor, it'll allow enough leakage current to maintain the relay in the energized condition, especially when the transistor has a higher gain. The TIP is lower gain, so it's apparently not leaking enough to hold the relay on. If you put a small biasing resistor from the input to ground the other transistor probably should work also.

Ahhh gotcha, thanks!'86 Ford Ranger 545/C6/EFI