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just wondering {newer Fuse box}
has anyone fit a newer fuse box in and how would you go at it. I have added a radio aftermarket tach and gauges and will install a line lock for the front brakes once I switch to disc brakes in front. I don't mind splicing into a wire but a new fuse box with lots of empty slots would work better I think.


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Just keep in mind the amperage limitation on the existing wires so you don't put in a higher-rated fuse than what Ford suggested.

Let me check your shorts!

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Im not going to replace my existing box but I am going to add a 2nd box. I'm going to go by a junk yard and find an under the hood box that fits my needs to put in my car I know the ford boxes have both fuses and relays in them. Im adding a line lock, electric radiator fan, a transmission cooler with a fan, electric fuel pump... and dont want to splice into the existing box! Plus the relays will help out with the higher amp pulling devices like the fans and fuel pump! Also moving the battery to the trunk, building the Stainless Steel box for it now!

1973 Mach 1 429 cu. in. H.P. TBD, C6 Reverse Manual Valve with 3500 Stall Tranny, 9" rear 3.90 PosiTrac
2007 Mustang GT Convertible Premium
I understand the amperage rating that is why I don't want to splice into wires. And I have seen a second under hood fuse box {my GF's nova has one} that was the reason I asked the question. I just want to see what some of you might have done and HERE IS THE BIG ONE HAHAHA "HOW?" Undecided


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here is what I used but I went with the new harness assembly not sure if you can get a new box only, but I think I would worry about 40 year old wire with a new fuse box.

when I rewired the car, I bought 2 8 gang spade fuse boxes. That was enough to wire up every single circuit to its own fuse. This way, no system can take another down with it and it very easy to troubleshoot and fault find. Eg: horn relay is on a 10amp fuse and the horn power is on a separate 20amp fuse, etc

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If your existing box is good I'd leave it alone and place a 2nd box under the hood! What I'll be doing is to run a separate feed from the + side of the Starter Solenoid to the new box and run all the accessoies that I'll be installing to it!

1973 Mach 1 429 cu. in. H.P. TBD, C6 Reverse Manual Valve with 3500 Stall Tranny, 9" rear 3.90 PosiTrac
2007 Mustang GT Convertible Premium
Have one hanging on the wall. Send me a PM.

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Just cruising along minding our own business when BAM!!! The LAWS show up.
Hey Eric,

I did something similar to what you're planning.
My post is like the 5th one down.

I think it cost me something like $50 all said and done.

thanks for all the reply's guys. I'll bookmark this thread for when I'm ready to do this. I will probably get into that next summer. This year I just want to enjoy the rest of the summer driving the car hehehe.


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