I've got a 1999 Dodge 1500 high-top conversion van in which I'm updating the wiring to remove old tech and add new tech. I'm leaving the mid-90s Mitsubishi made Chrysler head unit with the combo CD, tape player and radio featuring a 3-band EQ and non-switchable bass boost even though I will probably never use the tape player feature. Can anyone supply me with a wiring diagram with the color codes for each wire at the back of the Mitsubishi/Chrysler head unit that makes it clear what each wire's function is? I also believe that there are at least two versions of this unit, one with steering wheel control and one without. I have seen units that look exactly like mine that have the model numbers: PO4704383AG(not steering wheel controllable) and PO4704383AD(steering wheel controllable). My unit may have a different number than either of these... It seems to handle CDRs that I have burned on my computer just fine and my van is a 1999 so it is probably a newer version head unit. I don't know how to tell the difference from the front panel and I have not removed the unit to see the model number and would like to not need to remove it if possible, but if I must, I will. I don't know what steering wheel control means exactly in this regard and if the different models will have different wiring on the back of the head unit. Does steer wheel control simply mean that there can be remote controls on the steering wheel that control the head unit so hands can remain on the wheel? If I remove the head unit I will see the colors and can trace the wires using continuity testing but I want to understand what each wire connects to in the head unit itself, whether it is ground, 12VDC ignition switched, channel outputs, etc... What has complicated the tracing aside from hard to reach wiring is the addition of an Audiovox RB3600 Theater Surround System that has its own wiring harnesses that were added into and in place of the factory wiring to shunt outboard amplified TV output to the factory speakers. My van previously featured a 12-volt TV, a VCR, an outboard multi-cd changer, a game center connection and the output also branched out to some small headphone jack input panels for passengers in the rear of the van to listen to the TV and game output via headphones. I believe that some of the original factory wiring was cut out and replaced with differently color coded wiring harnesses for the RB 3600 that were designed to redirect signal from the front head unit through the RB3600 via a pass-through circuit to make it possible to toggle between the front head unit and the TV output using a rocker switch on the control unit for the RB3600 allowing the matching of the TV volume to the front head unit volume using a bias control, necessary because two distinct amplifier/pre-amp sources are being utilized. Now I want to eliminate the RB3600 (which I've already done) and restore the original wiring path of the head unit output that uses its own built-in power amp and pre-amp circuits to drive the factory speakers. (The control unit for the RB3600 has a rocker switch that offered only two options: amplified TV output(ON position) and a pass-through for the front head unit output(OFF position). While I've traced and labeled much of the wiring from the point behind the front seats to the rear of the van and located the many variations of 12VDC power sources and ground wires and speaker wiring and have identified the circuits that are switched on and off by 4 rocker switches in a front headliner ceiling panel labeled with icons for reading lights, overhead lighting, TV and VCR, there are still some wires that I have yet to identify that go into areas I can't track visually that may connect with the front head unit or no longer have a function with the old tech removed and I think the wiring changes colors in hidden places before reaching the head unit! Because of this, I'm not sure of what wiring I can remove as no longer useful, or if I will need it to regain the full output of the front head unit to all of the speakers which include tweeters, mids and woofers in the back that are disconnected at the moment. It would be difficult to connect the unmounted speakers at this point in the build out as a way of testing what wires work with the head unit so I would prefer to thoroughly understand the wiring first through a process of elimination. Only the door speakers in the front are presently connected and functioning and before I can re-install the back speakers, I need to build a custom headliner with side areas that will hold the speakers as the old headliner will not fit over the added roof insulation. I want to know what all the wiring does before I attempt to build the headliner/shelving so I can plan for access to the wiring for new lighting and outboard gear that will connect from the visually hidden wiring harnesses. So there you have it... Hope I'm being clear and not overly detailed in my description...