I have a 1997 Grand Caravan. I had some trouble installing an aftermarket stereo and found I had a bad adapter. Now I have no ACC + (red)on the van side but I do have the constant B+ (yellow). Is there an ignition relay that may cause this problem or is it an anti theft thing? I'm an electrician so be as technical as required. Thanks !

 

The red cable and the yellow are +12Vseparate to ignition mode or together to always on!