Batt master solenoid

[eman1200]

My replacement solenoid has this funky spark plug looking wire that my existing one doesn’t have. Existing has two black wires, one connected to each post. Do I, uh I mean my mechanic, just leave the new wire connected as it came and connect the two black wires the same as they were on the old one? I, uh, I mean my mechanic is clueless with anything electrical. Thank you. I mean thank you on his behalf.

 

[PT20J]

Looks like that wire is for installations that only supply a ground to one terminal to activate the solenoid. You can remove it since your installation has power and ground wires. 

[EricJ]

The previous drawing, i.e., the one to the left of your thumb off the pic, shows the device installed without that jumper wire.   Your installation doesn't have that, so the black wires are sufficient.    Re-using that nice, white terminal cover might be nice, though. 

[eman1200]

The previous drawing, i.e., the one to the left of your thumb off the pic, shows the device installed without that jumper wire.   Your installation doesn't have that, so the black wires are sufficient.    Re-using that nice, white terminal cover might be nice, though. 

Only thing I’m concerned about there is it has a different model number listed in that drawing.

[PT20J]

2 hours ago, eman1200 said:

Only thing I’m concerned about there is it has a different model number listed in that drawing.

The part says STS-M12 and the drawing is says STS-M12 / STS-M24. Is that your concern? I read this as the same drawing applies to the M12 (12 volt) and the M24 (24 volt) parts.

[N204TA]

Here are the whole installation instructions:

It says in Step 6 that if the old contactor has four wires, remove the jumper wire from the new one and then attach the wires in the same place as the old one.  

[eman1200]

Here are the whole installation instructions:
It says in Step 6 that if the old contactor has four wires, remove the jumper wire from the new one and then attach the wires in the same place as the old one.  

I did that. I have an avionics switch that has a normal up power position but also a down emergency position. When I replace the connections as they were, the avionics stack would get a blip of power but never power up completely. Then we tried moving the left ground wire to replace the right side ground and installed the battery ground the way they show in the instructions. Now the up switch fully powers up the avionics stack but the down emergency doesn’t nothing