How to Hook Up a Turbo Timer in the Audi TT


1. Disconnect the TT's battery terminals to avoid electrical shock during turbo timer installation. Remove the fuse box panel located at the driver's side end of the dashboard by gently prying it with a flat-head screwdriver. Remove the three 8mm bolts that hold the dash panel into place -- one is under the fuse box cover, and the other two are along the underside of the dash. Disconnect any anchored wires from the rear of the dash panel, then lift it free.
2. Locate the TT's wiring harness, located at the at the left side of the exposed dash portion. Use wire cutters to strip approximately 10mm of insulation from the TT's ignition wire -- the thick black wire in the harness that leads into the TT's ignition key slot. Wrap the turbo timer ignition wire around the exposed portion of the black TT ignition wire. Pinch the connection secure, then wrap in electrical tape.
3. Splice the turbo timer 12V source wire into any of the stock TT 12V wires. There are several 12V sources in the TT wiring harness. These are the wires with red insulation. Route the spliced turbo timer ignition and 12V source wires through the dash area, and connect them to their designated terminals at the back of the turbo timer device.
4. Loosen the 8mm hex bolt just above the TT's exposed fuse box. Wrap the turbo timer's black ground wire securely around the neck of the 8mm bolt, then retighten it. Route the black ground wire through the dash, and connect to its designated terminal on the turbo timer device.
5. Remove the rear ashtray from your TT's center console by firmly pulling up on it. Beneath you will see the TT's parking brake switch. It's the brown wire with a white strip, leading into the center console area.
6. Splice the turbo timer parking brake wire into the TT's parking brake switch. Route the turbo timer parking brake wire along the bottom of the center console, up into the exposed dash area, and connect it to its terminal on the rear of the turbo timer device. Tuck all excess wiring underneath the center console cover. Secure any hanging wires in the dash area to the stock wiring harness with electrical tape.
7. Replace the plastic dash panel and fuse box cover by the opposite procedure of removal. Using the supplied double-sided tape, mount the turbo timer into place atop the TT's steering column.