Roger on a picture.
The solenoid does not have a positive and negative post!
It has a post in which the positive cable connects to.
The other post (for the starter) is dead, but becomes "positive" too, when the solenoid activates. This temporarily makes the starter turn/ crank until you release the key.
If you put anything else on the starter side, it will only get powered while you are cranking the vehicle, then it will shut off when you release the key.
Only the starter, by itself, should be on the other fat post. (It really does not matter which post)
Anything else requiring energy should be stacked with the battery cable on the opposing fat post from the starter.
Just read yours, modified your picture.
Return with good news!
The Medic
Image (Click to make bigger)
Sunday, June 24th, 2018 AT 8:10 PM