On 2/9/2020 7:31 PM, Adam wrote:

My car's blower motor relay may be bad (or the cause of noisy fan). So I
found the following video...

How to Test a Relay the Correct Way
https://www.youtube.com/watch?v=ire7vyDqelg

However, I don't have a cordless drill battery (used in the video).
Will the following battery charger...

UPG D1724 Sealed Lead Acid Battery Charger (6V/12V Switchable Single-
Stage With Alligator Clips)
https://www.amazon.com/gp/product/B0...c_act_title_1?
smid=A10QFO4IXVZNRN&psc=1

work ? Other frugal ideas ?

An automotive cube uses 12 volts. Any 12 volt DC source will see if the
coil pulls in the contacts.
There is much more to checking a relay properly.
Pull in current, dropout current, contact resistance, and more.
But if just want to see if you can hear the armature pull in that it
will do that.