what truck is it in? I looked up the code for a clark and one thing mentioned was 1A contactor defective or welded tips,might want to check this?? Another thing it might be is the insulator UNDER the #1 REC might have a tear in it or not be insulating the REC good enough from the mounting base causing the REC to short to the base. Check the 1A tips first to see if they are welded.
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