In reply to TVR Scott :
this obviously is not everything i use in a harness. But this is essentially what i use in EVERY harness. Couple of tools missing (lighter, test light, depinning tool, and power supply not shown)
Ill post a full rundown for you from the laptop by editing this post, scott.
edit time:
for a full custom harness, this is my rundown.
to start with a fuse panel for the chassis and power distroobution, as well as feeds for all the accessories, i pick up a street rod harness. generally, i get the biggest one i can afford, generally a 21 circuit. in the duster, and other personal builds, i have used the EX wiring 21 circuit. its the cheapest way to get a fuse panel and bulk colored wiring. however, i disagree with some of their gauge determinations, their wire is not the highest quality with regards to insulation and strand count. ive also had issues with poor connections in the fuse panel itslf, but that may have been isolated incidents. for my customers, i only reccomend american autowire these days. they consistently have high quality products, that are designed right. they also share my ethos of overbuilding power capacity via gauge of wire.
as afr as terminals, theres a few options depending on what youre doing. american autowire and del city all sell the special terminals that were commonly used by the OE throughout the years up until the mid 80s, and gm through current. however, with super late model stuff with special connectors and terminals, i try to reuse the factory bits wherever possible. i then use the uninsulated butt splice connectors (bought by the hunderds from amazon) and adhesive lined heat shring tubing (yes, its a harbor freight case. but, trust me, its not harbor freingt contents anymore. again.. amazon. )
relays are bought with pigtails, and then i just reuse the plastic connector and repin with correct spade terminals.
after building, i put a dab of dialectric grease i the terminal before assembly. when i wrap the harness, ill use convoluted tubing for abrasion resistance. for looks, i prefer either using the self fusing silicone tape (loks factory) or the split f6 braided loom from amazon for looks.
i will aso usually build the harness with 1000s of zipties. every couple of inches the whole way down the harness, cut off when i add a wire, tightened when i reroute one from the bundle. keeps it neat and tidy. i also do it one wire at a time. starting with battery cables.
oreder of operations:
1. mount all electrical components (wiper motor, stereo, msd box, fuel pump, battery, etc) where i want them. these are absolutes, that are fixed points.
2. run main cable from battery to starter. run grounds from battery to frame. run wire from battery to alternator. you know, the really heavy gauge stuff.
3. mount fuse panel somewhere accessible.
4. connect the dots
5. cover harness
6. take nap and puck up 742 cut zip ties.