Hi, so as the subject says,I'm installing a new head unit (the Sony cdx-g3150up) in a '98 expedition EB with the mach audio system(no head unit when we bought it, or we'd likely just use the stock one), and I've run into a few problems
#1 and the one I want to fix first: the head unit will not power on UNLESS I touch a pair of speaker wires from the head units harness to the accessory power wire, at which point it powers up instantly and stays on until I stop holding the speaker wire pair to the accessory power, I'd really like to figure this one out (pic of how the head unit harness is wired to the aftermarket harness:
Imgur: The most awesome images on the Internet (the accessory power wire is wired with that cap for ease of taking apart since that's the one we need access to to test the head unit being we can only get it on through the method of problem
#1 ))
Problem
#2 : the speakers don't seem to be working, we tried connecting speaker wires from the head unit's harness to the plain wires sitting in the dash (the main speaker wires according to a
Crutchfield diagram I found online for the '98 with mach audio) and hooked up the fm/am antenna to test with(which does work, as the info of the station and the song that was playing showed up on the display of the head unit, so we have signal at least) and nothing came out of the speakers, not even static. Now I've read up on this and apparently it has something to do with the factory amp not turning on? What's a way I can test this easily?
And third problem which is also sort of a question: what are the extra wires in back that don't reach the front for?(pic at bottom) going by the
crutchfield diagram it's the speaker wires coming from the amp to the speakers (
1997-1998 Ford Expedition with Mach Audio Wiring Information look at the amp wiring section, the non-input labeled ones are the ones that match the wires in back) but the amp is most definitely there, i can see it hidden under the dash, could that possibly be that whoever owned it previously bypassed the amp? in which case how would i test those wires to see if it indeed an amp bypass, as it's not possible for me to wire it to the speaker wires on the harness that easily since they're way in back and bottom of the dash and can't be pulled up front (as you can see in this picture:
http://i.imgur.com/11AQVGO.jpg)
And last question, there's a random lightish blue wire that reaches all the way to the center console storage, it's been crimped off it appears but what would it likely be or have been for? (i've traced it somewhat, it appears to be going into the engine bay, can't tell for certain though, will get a picture of that aspect later, for now you can see it here hanging in the front of the dash right under what's supposed to be the speaker wires that go TO the amp from the head unit going by the
crutchfield diagram:
http://i.imgur.com/11AQVGO.jpg)
Thanks, any help is appreciated
