So the other day a buddy of mines truck caught on fire, he was lucky enough it didnt total the truck, but it did cause him quite a bit of engine bay damage with damn near half the wires burnt... Its something thats been on my mind ever since
@SpeedlabDan posted pictures of his unfortunate fire.. I sometimes forget how fast life will just take things away from you, regardless of how much you like them. As i was adding more and more wires to this distribution block on the front.. and i started to think of just how many connections i had made over time , and since i didnt ever really see the wiring on this truck as an entire project, but more or less something i just kept doing along the way as needed... I took a step back and thought about the whole thing..
At this point i had just removed the factory junbction block and had one main one under the hood. I got to noticing how dinky and cheap i was on my relay and fuse block. Sure it would probably work great but the underside where it was all pinned, was sure to be exposed to the elements.. the lid wasnt very tight, and next to that i had the power source (12v batt), and then beside that i had a distribution block, feeding power to everywhere else locasted near by. Sure, the power out of the relay block was fused, but the power in wasnt, the power to the distribution block wasnt and left some areas vulnerable to melting and potential fire..
Sooo given my tendencies to veer into oncoming lanes of different tasks... I am now re wiring the battery, ecm, and added accesory circuit of the truck.
i went and bought a cart for the shop ( much needed now that i have one! )
25' copper 4awg.
25' of copper 10awg
25 ' of copper 8 awg
It seems so much of the wiring i saw for sale was CCA... and when i did a little research on amp capacities, it seemed youd have to bump up a whole gauge of wire for the same amp rating on the copper clad aluminum stuff, so i opted for pure copper wire. I got some crimpers good for up to 1 ga, some inline 10 ga fuses, heat shrink, big pack of shrink connecters, and everything else i had always needed, but made "do" without.
First I removed the battery from the engine bay, mainly because that drivers side corner is already wire heavy with the headlight harness, horns, and it puts it right infront, and tight of the headlamp, close by is also the main cab connection..Once it was decided to remove the battery i was thinking about what side of the bed to put it on. The drivers side would be a nice straight shot out to new relay/fuse block, but zig zag to the the starter. I figured the heaviest gauge wire should be the shortest run. So with that in mind i am laying it out for a passenger side battery. This gives me a straight shot to the starter, it also gives me a straight shot back in the same route for the terminator to battery connection ( dedicated 12v and ground ).
I have had this aluminum box that a buddy made , laying around for quite some time which i think i will use. Im thinking about dividing it into two sections. One for roadside tools and one for the battery. The battery boxes ive seen for sale dont seem to be too big except for RVs.. and they are very expensive.... I bought one at the local store without measuring and it leaves me zero room for fun in the box.. My reason for wanting space is that i want to fuse the accesory power at the battery, also have a disconnect switch on the ground side, I dont want any chunk of wire to be left hot if something happened and fuses blew, leaving that one wire to melt and cause havok from the battery... especially if its running from the bed to the engine bay. The new relay and fuse block i ordered comes with distributed power bar, so i can eliminate a power wire feeding every relay seperately, its made in the usa and not made of cheap plastic. Comes with a 70amp fuse at the 12v power in and I also ordered up a water proof box for it. The photos arent exact but damn near close to what ill be getting. Wasnt cheap but a burnt truck isnt either...





I will be running an 8ga wire from the battery directly to the relay box. I wasnt sure if it was sufficient to run it off the extra wire i have that ran off the starter/junction block circuit. I figured a direct source would be best anyway, and then i could fuse it right at the battery. I currently only have two relays, but this will leave me space to add two more, which im sure will happen eventually. If i dont use up the spots for relays, im thinking i should be able to still have 2 fused, 12v power out sources off the box. I do plan on keeping the junction block in the engine bay for the dedicated 12v coil wire, and other 12v power needs from the ECU.
For the cab, instead of putting inline fuses in both heated seat 12v wires, and the inline fuse for the accesory charging slots.. i bought a 6 panel fuse block with 12v power in. This will let me run one power wire and have everything fused before it heads out to the accesory. I have one left over power distribution block with a 3/8 stud. I plan on using this for the cab grounds. I will run one 8 ga ground wire from the frame/cab to the distribution block and then i can attach any grounds now and in the future to it. I will install behind passenger seat with the fuse block.
I ended up eliminated alot of wiring all clustered in the engine bay. I havent drilled any holes in the box yet because i want to make sure i have my battery box figured out before i do, but i have the main strarter wire and holley ECU wires ran.


A little before and after of the engine bay so far. Still just making sure everything works for now. Ordered up some good wire loom and sorted the wires into designated groups. will wrap them all once final install.

