@larry311969 , Larry, check to ensure the brain has excellent grounding and all plugs free of corrosion/tightly connected, if all looks good, because intermittent, you will have to remove cover wrap/loom on brains wires and check wires individually for damage as a DVOM may not always pick up on the bad wire if making and loosing contact or just replace the trouble-sum brain wire harness. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.