GREDDY FULL AUTO TIMER INSTRUCTION MANUAL Pdf Download. Turbo Timer Power Harness Main Harness 1pc. Page 3 4-pin connector of the Turbo Timer. Then connect the black wire with the loop connecter to a good chassis ground.( to steel body) key switch connector Optional GReddy Turbo Timer Harness (sold separately) key cylinder 3-pin connector ground wire. greddy turbo timer harness - Nissan Forum | Nissan Forums May 11, 2006The harness from the turbo timer should have a green, red and blue wire these are the wires that the turbo timer need. Those wires lead to a harness that you connect to the Greddy intall harness which has four wires coming from it. The Red wire to the 12v, the Green to to ON, and the Blue to ACC of the ignition harness.