Re: 1989 ford crown vic
My suggestion would be to go on eBay and look for a parts manual there. You'll probably be able to find one in book form, and you may be able to find one on a CD-ROM. If you just want enough information to troubleshoot this particular problem, then look for an EVTM (Electrical & Vacuum Troubleshooting Manual). This is a fairly small book, so it will be far less expensive than a complete manual.
You can also go to an auto parts store and buy a Haynes/Chilton/whatever manual. They aren't as complete as the original Ford manuals, but they will probably cover your electrical system.
And as for your lighting problem, I would begin checking grounds. When those start going bad, you get all kinds of screwy problems.
1989 Ford Crown Victoria Police Interceptor
2bbl Carbureted 351W V8, ported and polished E7TE heads, Edelbrock cam
AOD Transmission with B&M Shift Kit
3.55:1 Positraction Rear Axle
Visit My Car Domain Account Here