Re: Shift light/output switches MS1-Ex Update: Kicking my butt!
Ok something is jacked up. ;D Imagine that.
1. Cooling fan comes on when I hook the battery up. It will do this even when the MS is not powered on or even if the X2 (X5 in this pic) output is not even connected to the transistor.
2. Evac does not come on when I hook the battery up, but if I bypass the transistor, it will turn on and continue to run even after I remove the jumper. It's like the relay stays energized once it it tripped. It will do this even when the MS is not powered on or even if the X4 output is not even connected to the transistor.
The relay's coil 12v source is the same as the relay's switched 12v source for the fan. I just added a wire from the 12v fan wire over to the relay's coil.
This is actually how I had it wired:
I'm getting the feeling the transistor for the cooling fan is toast. I have a larger TO-220 cased npn transistor (TIP3055) I can swap in. Will it work fine?
Since it worked fine when I was switching the 12v line on/off (keyed source) instead of the ground, I may just flip the connections around back to that way and see if works better.
Re: Shift light/output switches MS1-Ex Update: Kicking my butt!
Been learning about relays. I always though you just hooked them up. Apparently, there is a right way and a wrong way. I currently have pins 30 and 87 backward from what a reverse polarity relay should have.
Re: Shift light/output switches MS1-Ex Update: Kicking my butt!
Giant Buckets of WIN!!!
I feex'd eet.
Actually I built a new switching circuit and used considerably larger transistors (TIP120's) than they called for and everything is now golden. Evac pump and fans are now controlled by the MS. Also learned that anti-static foam is conductive. Makes sense, but you typically don't expect foam to carry a current.
Re: Shift light/output switches MS1-Ex Update: I win.
again, nice!!
see, the mods aren't THAT bad, after you learn a few things then they become pretty easy.
How do you have the Evac configured to come on - by RPM, TPS, ?
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Re: Shift light/output switches MS1-Ex Update: I win.
Had some input on this from another source:
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.
They suggested these diagrams as opposed to the one in the megamanual.
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