Thoughts on doubling up electrical wires

[califkid_66]

I installed my rebuilt alternator 12/30 Motorola let my engine idle but had forgotten to reconnect the power to the fan relay so I was waiting for the fan to go on so it got a bit hot
so I connected it and it took three minutes to get it cooled down enough for the fan to stop
My otter switch is 82 77 Celsius probably would have taken less time if my wire would have been connected I touched the wires and they were cold I’m gonna try again tomorrow cause I don’t want to bother the neighbours!!
I had my multimeter on my battery
At idle 13.76 when fan went on 12.93