Hi All,
I need a stock stereo wiring diagram for an MCI-9. I have the speaker diagram provided by the manual, but for some reason there isnt a stereo wiring diagram. I'm hoping that the stock stereo is 12v so I dont have to 'find' a 12v source in the drivers compartment.
If this isnt something that exists (the wiring diagram) I can figure it out with a multimeter, I just figured the diagram would be a help.
99% sure it was a 24 volt unit, mine was anyway (1980 MC-5C) Stud 55 in the front electrical bay is where you would find a 12 volt source, if it's wired in your bus (was an option) and if no one has taken it out. If it's there, there is a 30 amp fuse in a little twist cap fuse holder on the upper right side of the battery bay, just behind the door.
I suspect mine is the 24v unit as well.
Here's a really stupid question about Stud 55 that Ive been wondering about. I know it's 12v positive, but where do I get the 12v negative?
Hi;
Almost any piece of metal will do for a ground return.
Merle.
Don't all DC negatives, regardless of their voltage, return through the frame to the batteries? Because steel bus frames are not the best electrical conductors, it could be prudent to use a separate negative conductor, i.e. use 2-conductor copper wire instead of just one red positive, at least for the larger DC loads. (I'm doing this even for my water pumps that draw only about 7 A each.) It's no more work to run this 2-conductor wire, and as long as it runs without interruption from source to load without intermediate splices or connections it should be more reliable than using the frame as a return, and produce less voltage drop. Just make sure the wiring is sized for no more than 3% voltage drop under full load, and ideally less than that.
John
What 12v load are you planning to install?
Brian
The load (as defined on the website) is:
Maximum Power Supply Current / DC5V=1A
The unit is a Kenwood DNX 571:
http://www.kenwood.com/usa/car/navigation_multimedia/dnx571hd/index.html (http://www.kenwood.com/usa/car/navigation_multimedia/dnx571hd/index.html)