Auxiliary Fuse Block Wiring

caseycamby

Suspension Lift
Location
Marion, NC
I have my eyes on this bad boy (CLICK ME) and have a few questions that I haven't found definitive answers on yet.


1) What gauge wire should I run to the battery from the fuse block? Is that dependent on what I'm going to add or is there a general go to size. If I read it correctly, the max the block can handle is 100 amps. Should I account for that and use whatever size the chart says for the length of wire I need?

2) On the same wire from the fuse block to the battery, should I have an in-line fuse or circuit breaker? What are the pros and cons, if any? Should the size of the fuse/circuit breaker be dependent on what's currently hooked up to the fuse block or just 100 amps?


Also, if anybody wants to add any insight or advice on what I should or shouldn't do, it will be appreciated!
 
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Prime

Shut up Baby, I know it!
Admin
Location
Denver Adjacent
I ran 8GA to mine and have a 100A inline fuse right off the battery. That feeds all of my auxiliary lighting and my stereo amplifier.

In more direct response to your questions, fuses are never really a bad thing unless they're too small. Always place large fuses as close to the battery as possible (and reasonable). Like under the hood...not wherever you mount the fuse panel.

Technically, the size should be a sliding scale, but in all reality, 100A is going to cover you really for just about everything.
 

caseycamby

Suspension Lift
Location
Marion, NC
Right on. My plans are to mount this under the hood so that shouldn't be a problem there.

Do you think I'm good getting the one with out the negative terminals or am I missing out by not getting it?
 

Prime

Shut up Baby, I know it!
Admin
Location
Denver Adjacent
Personal preference really. The entire truck is a ground. So you can drop those on any bolt you can find rather than running them all the way back to the box. IMO, it makes it easier that way than running a ground all the way back to the box.
 

caseycamby

Suspension Lift
Location
Marion, NC
Personal preference really. The entire truck is a ground. So you can drop those on any bolt you can find rather than running them all the way back to the box. IMO, it makes it easier that way than running a ground all the way back to the box.

My exact thoughts. Thanks!
 

mudchet

Got Mud?<br><img src="http://i164.photobucket.com/
Founding Member
Location
Brentwood, TN
I am doing the same thing Casey. 8 gauge should be fine. The fuse block is rated to 100 amps max, so having a fuse for 100 amps makes sense. If you put a 200 amp fuse in there the fuse block will melt before the fuse blows. I use a breaker instead of a fuse. I really like the convenience of being able to shut off all my auxilliary stuff when i need to but they cost more than a fuse. I also use the fuse block with the negative terminals. For lights and stuff tou can go wither way. Winches, inverters and high amperage devices should have a cable going to the negative terminal of the battery vs using the truck as a ground.
 

Prime

Shut up Baby, I know it!
Admin
Location
Denver Adjacent
That's a good point. There are some things that are better to run directly to the battery for ground.
 
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caseycamby

Suspension Lift
Location
Marion, NC
Just another quick question pertaining to this..

On the 86 post of the relay, you have to have power to go through the switch to trigger the relay, right? Where do you guys get the power from? You only need just a little of power, correct?
 

Prime

Shut up Baby, I know it!
Admin
Location
Denver Adjacent
Yes. The power comes from the output of the switch. And a 5A circuit is enough to run all of your switches to the relays.
 

caseycamby

Suspension Lift
Location
Marion, NC
Okay so you're saying on one of my terminals from the blue sea, I need to run power to the cab to give power to the switches?

Is that where the distribution block comes into play?

I'm sorry.. I'm wiring dumb but I'm learning haha
 

thecoalition

Call me Daddy
Location
Richmond, Va
Ok Jay and I looked at mine today - we ran 4awg from the batter to the blue sea.

Casey - you should have it wired like this Switch > Blue Sea >Battery - the blue sea is distributing power to everything hooked into it. Now I believe that you will need to tap another wire for lights on the switches if you have the independant/dependant type.
 

Prime

Shut up Baby, I know it!
Admin
Location
Denver Adjacent
Okay so you're saying on one of my terminals from the blue sea, I need to run power to the cab to give power to the switches?

Is that where the distribution block comes into play?

I'm sorry.. I'm wiring dumb but I'm learning haha
Yes. One circuit on the blue sea with a 5A fuse will power all of your switches. You'll need to tap splice the pink wire in the day to run dash illumination if your switches support it.

It's complimicated.
 

caseycamby

Suspension Lift
Location
Marion, NC
Yes. One circuit on the blue sea with a 5A fuse will power all of your switches. You'll need to tap splice the pink wire in the day to run dash illumination if your switches support it.

It's complimicated.

Was that a yes to the distribution block as well? Is that the best way to splice the wire out?
 

Prime

Shut up Baby, I know it!
Admin
Location
Denver Adjacent
12v from the blue sea on a 5A fuse. Loops through on all of your switches that go to relays.

Those switches send that 12v to the relay and trigger the heavier load.
 

Prime

Shut up Baby, I know it!
Admin
Location
Denver Adjacent
This merely serves as a convenient place to pull power from for your accessories. If you need relays they would be separate from this particular panel.
 

01XterraPhilly

First Fill-Up (of many)
Location
Conshohocken, PA
oh ok...never really understood how they worked. im currently in the process of rewing a fuse block from a cherokee. its nice bc it has fuses hooked up to relays in one box. plus it was $15 from a junk yard
 

Txterror

Test Drive
Location
Texas
if you are wanting a one shot solution of sorts, there is the S-Pod that has built in power management and relay system into one unit. Just hook-up your switches or spend the insane amount for the touch screen. It is very user friendly, but extremely expensive.
 

caseycamby

Suspension Lift
Location
Marion, NC
So I think I get it now.. My only question to figure it all out.. How can I regulate the amps coming out of the blue sea to give power to the switches? Probably about 5 amps or so. How can I make sure it's not gonna throw 100 amps to the switches haha
 

Muadeeb

Bastard Admin from Hell
Admin
Location
Dallas
Current (amps) does not really work that way. The amount of current drawn is based on the load (resistance) of the circuit. The switches do not add any (meaningful) load unless they're bad.

So if you have a switch on a relay, then you only have a few milliamps running through that circuit. On the load side of the relay, you may have 30 or more amps being controlled. The relay is how you isolate the high current loads from the switch.
 

mudchet

Got Mud?<br><img src="http://i164.photobucket.com/
Founding Member
Location
Brentwood, TN
V= I x R

V = volts, so 12 for most automotive situations.
I = current, measured in Amps
R = resistance, measured in Ohms.

So I = V / R.
 

caseycamby

Suspension Lift
Location
Marion, NC
Wahoo!

8472402E-D701-41B3-939C-FDB9D866510B_zps9rwe06pt.jpg
 

caseycamby

Suspension Lift
Location
Marion, NC
More goodies! BWD 100A circuit breaker. And with that.. A couple more questions.

E6BA8FAF-7A59-4A2C-A110-CDEF1258578F_zps1yv7ge5j.jpg




What's your thoughts/opinions on running the ground wire off of the relay to a switch inside the cab and use the switch as an interrupter of the ground. And of course, wiring the relay accordingly.

Also, your thoughts/opinions on using dielectric grease on all the connections.
 

mudchet

Got Mud?<br><img src="http://i164.photobucket.com/
Founding Member
Location
Brentwood, TN
Grease : I haven't found a need for it. I have wheeled my rig in mud and dust and not had issues that grease would have fixed.

Regarding your wiring design I would need to see a diagram in order to give you good feedback.
 
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