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Looking for some good advice on wiring and fusebox changes. I do plan to make headlamp upgrades and such and read posts & articles on that. I'm thinking I should take a holistic approach to the wiring first to clean up & identify/label. I hear the wiring diagrams are of little use too. Any advice on approach, what to do (or not do) would be appreciated. Thanks!
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I think the wiring diagrams are very useful. It's just that they may or may not convey your cars wiring exactly. But it is better then nothing and without it you will spend many hours chasing down connections.

As for other aspects of the wiring. I just finished a restoration. Several modifications I made to my car made a lot of the stock wiring redundant.

I think you need to be honest about how many modifications your going to make. If the answer is very little then you should just use the stock harness. If the answer is a lot then you should consider installing a new harness during your restoration.

If your not restoring the car then the general modifications that we all talk about, replacing the fusebox and adding relays is a requirement. ( although i must say i like the look of my stock fuse box ).
Your approach may be dangerous, in that most people have a 3 month attention span on car modifications. After that, it ceases to be fun and becomes a chore to be avoided. I personally know of two Panteras who's owners got disgusted with the crummy Lucas wiring, and decided to convert the whole Pantera to MIL-spec wiring. Neither car has turned a wheel in a decade..... There are 3 or 4 'official' wiring diagrams; pick the one closest to the build date of your car to start with, then annotate it as you find a varient in your personal Pantera. There won't be many. There are two sources for modern fuse boxes one is Larry Stock in Reno. I'd start with this mod. Second would be to check the connections between the fan motors and the relays, or the fuse box, and be sure you are getting fill voltage to your electric radiator fans. Make corrections as req'd. Third might be adding relays to your headlight circuits, since now 100% of the current goes thru the headlight switch which is known to fail unpredictably with stock non-halogen bulbs. Worse, the bright/dim switch is incorporated into your unreplaceble turn signal switch assembly... I know of only one source for custom built headlight relay panels- Rick Moseley in CA
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