Author Topic: Ignition switch pin  (Read 8230 times)

Offline jforest1

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Re: Ignition switch pin
« Reply #30 on: September 17, 2015 - 02:59:33 PM »
Same results with the above tests after replacing ignition coil with this one:
http://www.summitracing.com/parts/tay-718222/applications/make/plymouth/year/1973/engine-type/v8/model/cuda/engine-size/5-6l-340

I think I'm going to lose my mind.

JF
'73 Cuda 340 Slapstick, A727 Torqueflite Transmission, Edelbrock Thunder Series AVS 1806, Vintage Air Gen IV A/C system




Offline jforest1

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Re: Ignition switch pin
« Reply #31 on: September 17, 2015 - 03:12:41 PM »
Okay, trying to reason through these issues:

Quote
In the Run position the lower plug GREEN/Red wire should show power reduced to about 5VDC going to the ECU
12.5vdc while running PROBLEM

Could this mean ANYTHING other than the brand new ballast resistor is bad or the wrong part?

Quote
the lower plug BROWN wire will drop to about 8VDC going to the coil, this is your run power after the resistors drop the voltage
8.5vdc while running with occasional drops to 1-2vdc

Suggests the wiring on the way to the coil has an issue, yeah?   Checked this and nothing looks.  I was concerned that the flamethrowers would be an issue but bypassed them and still the same measurements above.

JF
« Last Edit: September 17, 2015 - 03:27:40 PM by jforest1 »
'73 Cuda 340 Slapstick, A727 Torqueflite Transmission, Edelbrock Thunder Series AVS 1806, Vintage Air Gen IV A/C system

Offline Bullitt-

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Re: Ignition switch pin
« Reply #32 on: September 17, 2015 - 04:05:07 PM »
    In the Run position the lower plug GREEN/Red wire should show power reduced to about 5VDC going to the ECU

12.5vdc while running PROBLEM as stated earlier  My statement cf 5VDC came from one source I found here on CC.C, I was not able to confirm this number but we know it should be lower after going through the resistor ...if my car were together I'd just go take a reading so instead I'll make a post here to see if someone can do that

Could this mean ANYTHING other than the brand new ballast resistor is bad or the wrong part?

Quote

    the lower plug BROWN wire will drop to about 8VDC going to the coil, this is your run power after the resistors drop the voltage

8.5vdc while running with occasional drops to 1-2vdc

Suggests the wiring on the way to the coil has an issue, yeah?   Checked this and nothing looks.  I was concerned that the flamethrowers would be an issue but bypassed them and still the same measurements above.I have no idea what else could cause this other that a loose connection at or within the ballast given that you get a constant 12VDC coming in on the Blue wire. 
Wade  73 Rallye 340..'77 Millennium Falcon...13 R/T Classic   Huntsville, AL
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