What should happen to the plus so that the motor with the relay becomes a short circuit?

Question

Electronics

Gentlemen, there was a strange case the other day, there is a constant plus of 12 volts (in passing it is still connected to the light, which is working properly), connecting its wires and the retractor relay, gave out a short circuit.
If you connect directly to the battery, there is no short circuit, it draws in and twists.
Unfortunately, it was not advisable to disassemble everything and understand why this was so.
What are the versions of this unknown garbage?
Personally, I gave up after an hour of reflection and just made the 2nd wire from the plus purely for the retractor with the motor, it worked.
The strangest thing is that everything used to work from that plus, but after that it often began to refuse, and then give out a short circuit at all.
By the way, the short circuit was not always there, it sometimes disappeared by itself when the plug was pulled out of the retractor relay and connected back.

Answer 1

I don’t know what happens to the plus there, but the relay / motor windings and others until they store energy are copper wire, the resistance of which you can check with an ordinary ohmmeter and it is not very large.
If the solenoid relay is from a car, then it probably consumes 7-15 Amperes when turned on, most conventional power supplies will naturally go into protection against this, batteries, in principle, can afford this.
What is this mythical "plus", what is it from?