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Then you have the Volvo/Chrysler Ignition system.
"I checked the voltage drop on the (+) coil and it drop more than 10.5v like someone told me it read 9.3v How can the ignition switch be the problem for that?"
I think you are saying that the +12 voltage at the coil dropped TO 9.3v when cranking. If so, this may be hard to diagnose and explain. The normal voltage path to the coil has many connections, any of which may be corroded and not conducting properly — especially in a car that has not run in 4 years.
But — there is a special voltage path to the coil that is just used just for starting. It comes from a Brown wire at Starter teminal #16.
It's purpose is to give the Coil a full 12v when the starter is cranking.
Once the engine is started, the coil voltage then comes through a Resistor (white porcelain cylinder) near the right hood hinge.
The resistor reduces the coil voltage for cooler running.
For Starting, the Brown wire at the starter gets FULL Battery voltage when the starter is engaged for cranking.
From Starter #16, the Brown wire goes to the "running" Resistor up near the right hood hinge area.
At the resistor, it connects to another Brown wire, which goes to Coil #15, where you tested and got 9.3 volts.
It is possible the 9.3v you saw was the reduced "running" voltage — and you are not getting the FULL +12v from the Starter terminal #16.
Or — it may be just that your battery is not fully charged, and is weak from all this trying to start.
I doubt you have an Ignition Switch problem if the starter is working.
TRY THIS: Run a temporary jumper wire directly from the Battery + to Coil + 15, and see if you then get a spark while cranking.
You can leave this wire connected if the engine starts, otherwise take it off when you are through testing.
The Normal running voltage to the resistor comes (via the "many connections" mentioned above) via a Blue wire from the hot (unfused) side of Fuse 11.
The +12v comes to Fuses 11, 12, and 13 from the Ignition Switch, which gets the +12v from a small, black Junction Box near the Battery.
The Junction Box gets the +12v via the smaller Red wire at the Battery + terminal connector.
My time is limited right now, but I will help when I can.
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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