Back-up switch question
 

Will be installing a back-up camera that will feed to my Nav screen soon so I need to find the best location to tap into the back-up light circuit.

Is the switch on the tranny on the (-) ground side or (+) side of the circuit? Thought I'd run across the answer on a thread but could not find with a search

I'll need to tap into the (+) side to activate the camera. Best location will probably be at the tail light.....but I'll need run a lead to the Nav dock in the trunk.

Any chance of finding a hot "switch activated" tap location in the trunk?

Thanks!

Wiring connections...
 

Mark,

If your '87 has similar wiring diagram to early Carrera or SC's, the're many connecting points in the trunk you could tap power: (a). Ignition switch OFF: fuses for interior lights, and warning light for heated windshield. (b). Ignition ON: There several points, fuses for bak-up lights, air blower relay, sunroof, windshield wiper, cigarette ligther, and fuel pump relay. Use a test light and you'll find these points.

The 915 trans back-up light switch is a ground (-) contact switch. The 3 fuses at the rear are also a good source for power. Hope this will help you.

Tony

Tony, thanks for the suggestions and confirmation that the back-up switch closes the ground. Finding a power source in the trunk is not a problem......what I need to find is a back up switch powered circuit to trigger the Source Selector on the LCD Screen from Nav to Back-up Camera when I shift into reverse then back to Nav when out of Reverse. Not sure if tapping into the low side of the back-up light circuit fuse will work????

Just out of curiosity... do you actually have trouble seeing back there? Or is this simply a neat gadget exercise?

-michael

Both but clearly more of a gadget excercise since the nav screen has video camera input. :D

Gave you the Wrong Information
 

Mark,

I gave you the wrong information about the back-up ligh switch. The 915 back-up light switch (F4) carries power from the ignition switch to the back-up lights. So F4 (back-up light switch) is a + on/off switch for power not ground as previously stated.

I'm surprised nobody noticed the error. Sent PM too.

Tony