1 - Make sure there is more than 100,000 ohms resistance from the frame to each of the power cables with the battery disconnected. If not, disconnect the drive motor and see if that is what has the ground.
2 - bad K2 plugging relay
3 - bad rec #1
4 - deteriorated scr # 1, 2, or 3
5 - control card problems
What kind of mechanics were these and how much did they charge?
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