76 Fuse box in a 70?

[matt030305]

Hey all. I recently picked up a 70 duster that does not have a working heater (originally an ac car but was taken out when a 340 swap was done by PO. So I started looking into the problem as the colder months are on the way. Turns out not only is the heater not hooked up correctly, but the wires are like a birds nest. I looked more into it and attempted to rewire the heater wires to the fuse box to find that it has a later date fuse box in it than the conventional 6 fuse box that’s usually in 67-72 a bodies. If anyone could help me figure this out I would greatly appreciate it!

 

[Dave999]

i'd look for a good used standard box

and match up the colours from the manual

(i'm making this up the colours are not correct)

i.e top of box has red wire into back
bottom of box has black wire

one is switched of an on by igntion key, one is on all the time. and they each connect to a section of the box where all fuses in that section are linked togther at one end to privide a bank of fused supplies for equipment in the car.

front of box fuse one is on the bus bar connected to the fat red lead, fuse has a green wire on the other for equipment x etc etc

or do simlar with what you have, it just won't match the pictures in the book

segment that box
the smaller section is for none switched stuff.. on all the time
the big section is all on the part that has its power into the box switched by the igntion key

lable fuses in each section 1,2,3,4.....n

and macth the wires in an out for fuse 1
then fuse 2 in each section

you can spot sections on the simple style boxes because if you look at the back you will see that all fuses in 1 section are connected togther on the back and are not connected to the other section.

the swicthed feed goes to the big section.
the none swicthed feed goes to the smaller section


i.e on the none swicthed segement
cigarette lighter
horn
interior light

on the swicthed segement
wipers...
fan

Dave

 

[townsend]

Maybe consider this.

Fuse Block 1963-67 Chrysler 1966-67 Polara/Monaco 1970-73 A-body, Harnesses Misc, 172-FB5211 Reproduction, NOS and Used Mopar Muscle Car Parts

www.megapartsusa.com

 

[Mattax]

That box was used in 1975 as well as other years.

Regardless, as Dave explained, the concept is one buss is connected to the main splice. It's hot all the time.
The other buss is connected to the switched accessory feed.
Optional equipment would get jumpered to the appropriate buss with another fuse
One small ampreage fuse is for the instrument panel gage and radio illumination lamps.

As far as wiring. The easiest way to get it right is to take the whole thing out and lay the harness on a bench or plywood board. Then replace wires and wrap.

Entire 69 dart wiring harness

Ok… so here’s my dilemma. I’ll preface with Im an electrical idiot… Got a new 69 dart in pieces… needs a wiring harness, but came with a brand new wiring harness. Only problem is the wiring harness it came with is a universal wiring harness, the American Autowire Highway 15 wiring harness...

www.forabodiesonly.com

Here's my 67 on the bench. You can see how the harness was routed to the black fuseblock.

Plug-and-Play Wiring Harness

www.forabodiesonly.com

More photos here (67) New wiring for our ‘67 B’cuda

Here's a '70 fuse box photos and discussion.

1970 Dart ignition wiring issue.

I have a 1970 Dart Swinger with a 318 in the car. The previous owner had an aftermarket Pro Comp distributor in the car. I have changed it back to a Mopar style distributor with an orange box. The car cranks over fine but I have no spark at the moment. I have the distributor plugged in. Black...

www.forabodiesonly.com

 

[Mattax]

If you need to make junctions
Inline wiring splice clips........from the Dodge RAM service manual

 

[matt030305]

i'd look for a good used standard box

and match up the colours from the manual

(i'm making this up the colours are not correct)

i.e top of box has red wire into back
bottom of box has black wire

one is switched of an on by igntion key, one is on all the time. and they each connect to a section of the box where all fuses in that section are linked togther at one end to privide a bank of fused supplies for equipment in the car.

front of box fuse one is on the bus bar connected to the fat red lead, fuse has a green wire on the other for equipment x etc etc

or do simlar with what you have, it just won't match the pictures in the book

segment that box
the smaller section is for none switched stuff.. on all the time
the big section is all on the part that has its power into the box switched by the igntion key

lable fuses in each section 1,2,3,4.....n

and macth the wires in an out for fuse 1
then fuse 2 in each section

you can spot sections on the simple style boxes because if you look at the back you will see that all fuses in 1 section are connected togther on the back and are not connected to the other section.

the swicthed feed goes to the big section.
the none swicthed feed goes to the smaller section


i.e on the none swicthed segement
cigarette lighter
horn
interior light

on the swicthed segement
wipers...
fan

Dave

Hey Dave, thank you for all the information! I’m going to trace everything tomorrow and like you said, purchase a standard fuse box and go from there.

I have everything out of the dash essentially, just want to get this heater working before I put everything back!

 

[matt030305]

That box was used in 1975 as well as other years.

Regardless, as Dave explained, the concept is one buss is connected to the main splice. It's hot all the time.
The other buss is connected to the switched accessory feed.
Optional equipment would get jumpered to the appropriate buss with another fuse
One small ampreage fuse is for the instrument panel gage and radio illumination lamps.

As far as wiring. The easiest way to get it right is to take the whole thing out and lay the harness on a bench or plywood board. Then replace wires and wrap.

http://[URL]https://www.forabodieso...69-dart-wiring-harness.538142/post-1974258892

[/URL]

Here's my 67 on the bench. You can see how the harness was routed to the black fuseblock.

http://[URL]https://www.forabodieso...nd-play-wiring-harness.532627/post-1974200964

[/URL]

More photos here (67) New wiring for our ‘67 B’cuda

Here's a '70 fuse box photos and discussion.

http://[URL]https://www.forabodieso...-ignition-wiring-issue.543178/post-1974348335

[/URL]

Right now everything else works besides that so what I’ll do is rewire the heater to the fuse box and worry about wire organization at a later date. I do plan on getting a repo wiring harness in the future. I’ll make what I have now work! I looked at your photos and it helped out a ton. Thanks!

 

[67Dart273]

Your problem may not be "just" the fuse box. There were a LOT of changes over the years in harnesses, and someone may have "hacked" a later or parts of a later harness into the car.

Unless you want to rewire the whole thing, you may be better off picking one circuit at a time and fixing what is there. It is also very possible that a given problem, like the heater, may not have anything to do with the fuse panel

 

[Mattax]

Whichever fusebox you use, it should be mounted, not hanging by the wires. That will stress the connections, creating reistance and failures.