TM 10-3930-659-20 6-60. ENGINE FRAME WIRING HARNESS MAINTENANCE (Con't). 6. Connect hydraulic oil filter restriction switch lead connector (10) to hydraulic oil filter restriction switch lead (11). 7. Install frame ground terminal lead (8) on frame (12) with screw (9). 8. Connect engine frame wiring harness connector (7) to connector (6). 9. Install engine frame wiring harness terminal lead (4) on fuel level sending unit (5) with nut (3). TA707888 6-220