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engine died today.... |
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FSJunkie 
AMC Addicted 
Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4742 |
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 Topic: engine died today....Posted: Jun/02/2022 at 3:50am |
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Diodes can go bad in the alternator or regulator and cause power to back-feed through to the ignition coil. The resistance of the alternator warning light in the dash plus other resistors in the system are enough to stop it normally. Engaging the parking brake creates a ground through the switch on the parking brake pedal assembly that might draw enough current sway to stop it.
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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bikerfox
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Joined: Aug/02/2009 Location: USA Status: Offline Points: 4473 |
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Posted: Jun/01/2022 at 10:26pm |
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Tony,
Searching for the elusive resistance wire produced these two results. Pls. read them. Also, in case you want to go the relay route, the last link explains how to do so. |
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1969 Rebel SST (1970-1987)
1968 AMX (2005-2011) 1969 SC/Rambler (2011-2019) 1970 Javelin (2019 to ?)"Jane" |
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amico
AMC Fan 
Joined: May/08/2017 Location: park ridge il Status: Offline Points: 11 |
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Posted: May/31/2022 at 11:14am |
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LMK<
Absolutely. Otherwise need to take some at next show. PLs give a call and we can work it out 847-687-5836 Thanks
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bikerfox
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Joined: Aug/02/2009 Location: USA Status: Offline Points: 4473 |
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Posted: May/30/2022 at 12:59am |
Tony--do you still need pics? Sorry I didn't respond earlier. Been gone for a few days and haven't checked messages. LMK.
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1969 Rebel SST (1970-1987)
1968 AMX (2005-2011) 1969 SC/Rambler (2011-2019) 1970 Javelin (2019 to ?)"Jane" |
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amico
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Joined: May/08/2017 Location: park ridge il Status: Offline Points: 11 |
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Posted: May/25/2022 at 12:46pm |
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Bikerfox,
Any chance you have detailed pics of the wiring of your 70 Javelin engine bay? I have a mess on my hands and I'm confused by the wiring diagram . Especially the hookups to the solenoid and from the solenoid to the coil.Ill treat you to a case of beer if you can help. Tony
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bikerfox
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Joined: Aug/02/2009 Location: USA Status: Offline Points: 4473 |
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Posted: Dec/24/2021 at 1:11am |
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Well, "next month" arrived early, thanks to my good buddy Al Tyler, who came
over on a rainy day to help diagnose the issues. Hard to believe after quite a few intelligent eyes gazed upon the relay installation, but it appeared to be wired incorrectly. After fixing the incorrect wiring and adding a 6A 100V diode to the + coil side, the engine finally shut down when the key is turned to the off position!
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1969 Rebel SST (1970-1987)
1968 AMX (2005-2011) 1969 SC/Rambler (2011-2019) 1970 Javelin (2019 to ?)"Jane" |
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bikerfox
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Joined: Aug/02/2009 Location: USA Status: Offline Points: 4473 |
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Posted: Dec/07/2021 at 2:17pm |
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So, results of the diode experiment: it didn't work.
Tried it on the orange wire, south of the VR; reversed the diode and tried again. Tried it on the positive portion of the coil. It wouldn't let the car start! Tried it the other direction and you know what happened. Then, I tried a new ignition switch, since that's easy and no change. I'm going to have to drop the dash façade and do some troubleshooting. Thanks again to all who assisted in this endeavor. I'll be in touch next month.
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1969 Rebel SST (1970-1987)
1968 AMX (2005-2011) 1969 SC/Rambler (2011-2019) 1970 Javelin (2019 to ?)"Jane" |
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bikerfox
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Joined: Aug/02/2009 Location: USA Status: Offline Points: 4473 |
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Posted: Nov/30/2021 at 10:30pm |
Thanks for your thoughts, Phat. The diode will be here tomorrow and I'm going to give it a try, as it'll be simply clip-leaded into the line. Easy peazy.....you read my mind--next stop, the ignition switch "zone" (play on the TW show). Already have a new one and ready to try it out. Yes, it seems like everything electrical is more diffi- cult on a '70 than with a '68-'9, esp. when it comes to dash issues. I'll report back as soon as the diode is clipped in.
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1969 Rebel SST (1970-1987)
1968 AMX (2005-2011) 1969 SC/Rambler (2011-2019) 1970 Javelin (2019 to ?)"Jane" |
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PHAT69AMX
AMC Addicted
Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5926 |
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Posted: Nov/30/2021 at 5:11pm |
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bikerfox - unsure exactly what the "back feed" actually was or what did it for sure.
Disconnecting the 1968 2-Wire Headlight Buzzer fixed the issue. Still used the stand-alone E-Brake Light & Harness as a "hidden" in-dash Shift Light. Ran MSD 6 Box, Delco type Distributor, UniLite Conversion, Stock Tachometer, Motorola Alternator. Required both a Dual Mopar Ballast Resistor & a Single Ballast Resistor per MSD instructions to make the stock tachometer work and to prevent engine run-on. Used no Diode. Use of UniLite results in MSD 6 being "White Wire Triggered", that makes a difference as to what works. Further study of the AMC Schematics, some info in my previous post is incorrect. Fuse Panel is rotated in all different orientations between in the car, in the Elec Chapter, & in the Schematic. Had me dizzy  But the E-Brake & Buzzer ARE NOT HOT with the Ignition "OFF"so THANK YOU to who it was that pointed that out. If I can, will try and find & take the time & go back and edit - fix previous incorrect posts... I would suggest you consider removing your Ignition Switch and Testing it per the TSM procedure, but I reckon maybe that is no where near as easy to do in a 1970 as it is in a 1969 model. If something gets whacko in the Ignition Switch internal contacts it can cause issues... Maybe at least try spraying some WD-40 into it and working it in an attempt to clean it, and / or remove or mitigate some or any contact surface oxidation being as it's 50 years old... Peace
Edited by PHAT69AMX - Dec/01/2021 at 8:45am |
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Bucks AMX
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Joined: Oct/18/2015 Location: Michigan Status: Offline Points: 88 |
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Posted: Nov/30/2021 at 9:05am |
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Yes I used a 1A 100V diode.
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1970 AMX 390 4spd Golden Lime
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amico wrote: