To diagnose if you have a purple wire problem after the battery terminals are clean and tight: add a wire to the solenoid terminal and use it to jump directly to the battery. If it works better, the purple solenoid wire has an issue. This connection goes from the battery thru the firewall, thru the ignition switch, thru the park switch (auto trans) then to the solenoid.
A good opportunity for poor/worn connections over time.
I had a problem on a car that had the battery in the rear section (Caddy Allante) that began to have solenoid issues so I added a relay in the solenoid circuit to shorten/ eliminate the long OEM connection. Problem solved. Then again the car has an Italian electrical system....'nuff said!
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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