OP

Quoted from vid1900:

UPDATING OLD SS FLIPPERS:
=
=
=
=
Ok, so you've got an old game like Disco Fever and you want to update to the modern style flipper mechs. This will REALLY tighten up the feel of the game and eliminate that 'bounce back' feel.
First label your wires so you know where your 28v and ground is.

OP

Quoted from vid1900:

Believe it or not, you don't want to change the strength of the slingshots.
If you have ever put a stronger coil in just to keep the game running until the proper coil comes in, you often find that 1 out of 10 shots go directly into the outlanes.
The shot geometry that was so carefully plotted by Mr Ritchie only works with the proper coil.
So as Zacaj says, rebuild them and enjoy. You won't believe how powerful they are when you take all the slop out of the system.

OP

Quoted from vid1900:

As you own experience has shown, you DO get different readings on a coil when it is still connected to the rest of the circuit.
Do you ALWAYS have to disconnect a coil to test it? No.....
As you work on more games, you get a **feel** for what a coil should read, even in circuit.
If one pop coil reads .2 and all the others 3.6, you know you have a problem.
So if you saw a .2 coil, you would certainly unsolder that coil and test again.
So if out of the circuit, you still have .2 ohms, you snip one leg of the coil's diode and test again.
If the coil now reads normally, you only have a bad diode (and a 2 cent fix).
If the coil still reads .2 ohms, even with the diode snipped out of the circuit, it's internally shorted - dead.