Since we’re not building spaceships (yes, I’ve worked for NASA), any
basic multimeter from Harbour Freight will do. Check this site for coupons:
http://hfqpdb.com
Here’s video on how to use multimeter:
https://www.youtube.com/watch?v=SLkPtmnglOI
7. Disconnect input and output wires from both coils and measure resistance:
- between 2 input terminals, should be 2.1-3.2 ohms
- between spark-plug wire output terminal and coil mounting-bolt, should be 10-16k ohms