Coil and transistor getting hot. engine hunting!

[shauno]

Well, I might have two problems here but I'll start with the first.

I've searched for weeks and read every coil/transistor thread around.

I've checked wiring and replaced both coil and transistor from a z31 twice, they all get really hot after about five or ten min.

My wiring could be the issue but it does run so I'm stumped.

I'm running motec ecu and an 83 optical dizzy.

My wiring is as follows;

yellow wire for signal goes into transistor black wire.

black/white wire for 12v goes to coil pos.

blue wire from transistor goes to coil neg.

Black/dashed white wire from transistor goes to ground.

 

Am I missing a connection somewhere?

I don't have a resistor in place anywhere.

Should the coil be getting 12v all the time while running? (pos coil to engine ground)

Should the coil neg side be getting any voltage when measured to ground?

I've checked the harness for any possible grounds.

None of the wires get hot just the two components.

 

One thing I'm confused about; should the black/white 12v wire be tied into the yellow signal wire from ecu for triggering?

Could I have a bad ignition switch?

 

All grounds in engine and chassis have been cleaned.

What could cause them to get hot? To me it seems like to much current flow.

 

Maybe my alternator?

 

PLease someone give me some insight.

 

Thanks you.