1988 Gran Sport wiring diagrams! PLEASE HELP!!

[Mhadokowitz]

So a friend of mine has a 1988 Gran Sport that I (reluctantly) was commissioned to repair some of the cosmetics of the boat and then do a complete color change, inside and out, this past summer. I spent many years in the custom automotive business as well as owning my own hot rod/restoration shop for nearly a decade, so the project wasn’t anything I couldn’t tackle. Unfortunately the guy he hired to do all the mechanical repairs/upgrades and re-wire the boat was a complete mess, drug addict and all, so now my buddys boat is all painted looking beautiful but the wiring is a complete loss in my opinion. I told him if I can find some quality wiring diagrams I am willing to jump in and do it for him. Beyond myself, he can’t find anyone anywhere to hire locally to do it. I am fully capable of the work, I just NEED DIAGRAMS!!! Please can someone help??

[CptBill]

There really is no wiring diagram per say boats are not like cars they don't have wiring harnesses. For engine and mechanical stuff try a Sealoc manual for that year and engine/drive (Merc, Crusader, Volvo , etc.) as far as the rest of it goes when it's wired at the factory they put number or letters on both ends of the wire and each component is wired individually, so #5 might be power to the main breaker panel so that red wire would have a #5 at each end. Now you can also look up each component and it will have a wiring diagram of how the manufacturer wants it wired. Wellcrafts made before 2008 don't have much info out there, when they went out of business someone bought the name only and it seems that all the specific info was lost. so wiring is one of the trickiest parts especially after 33 years and a lot of hands doing things. Good Luck

[Billm]

How bad is it? Is it just the fuse blocks or did he steal all the wiring and sell the copper? Everything is color coded. There are no numbers on the wires. Mine has 3 switched fuse blocks off the master red switch and one unswitched. Some of the circuits come off panels inside the boat and some off those fuse blocks under the helm that are mostly connected to helm switches. Maybe someone with a Gran Sport can send a photo of the area under the helm station. I can give you all the color codes for my boat, hoping yours is the same. Are the green bonding wires still there? Important to restore them. I hope he didn’t touch the 120 volt system.

[daveswellcraft]

This was in my manual.