[Curtis Thornton]

I am installing electric fuel and water pumps and electric fan on my 68 camaro. I have run a primary wire from a juction box to a 30 amp breaker then from the breaker to a relay. My question is do I need a fusable link in between the breaker and the juction box. Also should I put a breaker or a fusable link from the battery to the junction box.

I am also installing a MSD 6 AL box under the dash. Once i read the direction that came with the 6AL box it said it was not recommeded to put in an enclosed place like under the dask ---- I was wondering it anyone knew why -- or if anyone has installed their 6AL box under the dash and how did it work.

[SSedan64]

Should be fine how you have it wired.
Make sure your Breaker & Relay will handle the Fan's startup load, which can be high.

Ignition Boxes need to be mounted in the open for cooling. You could rig some cheap PC cooling Fans & a Case if you mount it under the Dash.

[oldred]

Originally Posted by Curtis Thornton

Also should I put a breaker or a fusable link from the battery to the junction box.

Not sure how far away the box is from the battery or how exposed the wire will be but just remember that any wire between a breaker/fuse and the power source will be an unprotected circuit unless fused right at the power source. That's why fuse links are used right at the power source so it is always a good idea.

[Curtis Thornton]

Thanks that is what I will do. I will put a small fuse link with a 30 amp fuse and put a pc cooling fan on the 6AL box. The pc cooling fan is a great idea I never thought of that. I bought the relay wiring kits from Jegs they came with 30 amp breakers I hope that is good enough

[75gmck25]

If you are running a fuel pump, water pump, and fan I doubt that a single 30 amp breaker will be enough. Most fans draw about 30 amps by themselves, and then you are adding the fuel and water pumps. Or maybe I don't understand how you are going to wire it.

Bruce

[Curtis Thornton]

No I have a 30 amp breaker on each one

[Cape Cod Bob]

30 amp breaker on a FP seems to hi for it. What does the FP draw ?

[Curtis Thornton]

a 30 amp breaker is what came with the relay kit purchased from Jegs so I guess I will use it.

[oldred]

Originally Posted by Curtis Thornton

a 30 amp breaker is what came with the relay kit purchased from Jegs so I guess I will use it.

The fuse is sized for the wire and not the device so if you have a wire that is too small for the fuse going back to the pump you may as well not even have a fuse. I am not saying anything is wrong with what you have and that example was just to make a point but you need to look at the size wire you have and select the fuse based on that. Simply using what you have on hand without determining the proper size for the wire is dangerous, a wire that can only carry 20 AMPs can burn with a 30 AMP fuse the same as if no fuse at all had been used.

[BYT86GN]

Hey Curtis where are you going to mount the electric fuel pump? I am thinking about going in that direction as well I just wasn't sure of the best place to mount the pump. Thanks Mike