1). If the black ground wire is not already connected to the CDI box, fasten it to one of the 4 mounting holes on the outside. 2). Fasten the other end of this black wire to a good engine ground. 3). If the engine uses an orange colored lead, connect it to the "black/yellow" stud on the new box. Replaces part numbers: 332-7778A12, 332-7778A9, 332-7778A6, 332-7778A3, 332-5524A1, 332-7778A1, 332-7778A7 Applications: For Mercury 50hp 3cyl 6428681-0D000749 For Mercury 60hp 3cly 6428681-0D000749 For Mercury 65hp 4382057-4571651 For Mercury 70hp 4571652-5128279 For Mariner 70hp 5128280 - Later For Mercury 70hp 5579016-6428680 For Mercury 70hp 3cly 0C272000-0D283221 For Mercury 75hp 3cyl 0C272000-0D283221 For Mercury 80hp 3cyl 0A996142-0C221999 For Mercury 90hp 6cyl 5299506 - Later For Mercury 90hp 3cyl 0A996142-0D283221 For SportJet 90hp 0E023150-0E095087 For Mercury 105hp Jet 0D082000-0G303045 For Mercury 115hp 6cyl 5314656 - Later For Mercury V-135 0A904646 - Later For Mercury 140hp 5327663 - Later For Mercury 140hp Jet 0D082000-0G960499 For Mercury V-150 4868998-5129429 For Mercury V-150 XR2 6616991-0A904645 For Mercury XR4 Magnum II 0B242885-0D819999 For Mercury V-150 XR6 0D82000-0G960499 For Mercury V-175 4301235-5180108 For Mercury V-175 EFI 5180109-0G960499 For Mercury V-175 XR1 5180109-0G960499 For Mercury V-200 4839034-5158928 For Mercury V-200 XR1 5158929-0G960499 For Mercury V-220 0B117316 - Later For Mercury V-225 5628028 - Later Material: ABS Color: Black Package Contents: 1 x CDI Power Pack Note: Only the above package content is included; other products are not included. Light and different display settings may cause slight variations in the color of the item in the picture compared to the actual item. Measurement may vary by +/- 1-3 cm.