MadeFromMetal
New Member
I had a radiator blow a week ago and went to test a electric radiator fan on the battery:
It was jammed with a piece of the fan shroud. Removed the plastic and it worked with a D battery. But needed to test with my Jeeps 12V battery, to see if it went full speed.
I used a 10AWG OFC primary wire to touch + wire to battery, the negative fan wire is bolted to frame bolt. As soon as I touched it, sparks flew and the fan jerked out of my hand like it had high current surge.
Why does this happen when touching a wire to battery post but not when it's properly wired before turning on switch?
How dangerous is testing the fan this way and what way do you recommend testing it?
My power circuit probe can only do 7A before it shuts off (safety feature).
It was jammed with a piece of the fan shroud. Removed the plastic and it worked with a D battery. But needed to test with my Jeeps 12V battery, to see if it went full speed.
I used a 10AWG OFC primary wire to touch + wire to battery, the negative fan wire is bolted to frame bolt. As soon as I touched it, sparks flew and the fan jerked out of my hand like it had high current surge.
Why does this happen when touching a wire to battery post but not when it's properly wired before turning on switch?
How dangerous is testing the fan this way and what way do you recommend testing it?
My power circuit probe can only do 7A before it shuts off (safety feature).