Electric schematic for light bar & fan

Hello! I wanted to show you my electric schematic for led light bar & electric cooling fan for radiator. Is it correct?

Why are your circuits fused twice?

Just to be more safe and it isnt really much work to fuse twice

So why not fuse six times then?  Think of the safety.  And the children.

I don't understand your switch symbol.  You are using Radio ACC + to energize the relay coils, why is there ground going to the switches?  You only need a SPST switch, with ACC+ on one terminal and the coil on the other.  The symbol you are using for the switch implies a SPDT switch and if it were wired the way the schematic implies, with the ground on the common terminal, you would make a direct short between the ACC+ and ground when the switch was thrown in one of the directions.

stukndapast said:

I don't understand your switch symbol.  You are using Radio ACC + to energize the relay coils, why is there ground going to the switches?  You only need a SPST switch, with ACC+ on one terminal and the coil on the other.  The symbol you are using for the switch implies a SPDT switch and if it were wired the way the schematic implies, with the ground on the common terminal, you would make a direct short between the ACC+ and ground when the switch was thrown in one of the directions.

My bad. I have switches on-off with 3 pins. Gonna look for SPST switch then. Idea is to take power from radio wire for relay(86). Radio only works when iginiton is on. So light bar&fan will work only when ignition is on.

Excluding that is everything else okay?

The switch i have with 3 pins

You can use those switches, but you don't need to connect to ground.  Its sufficient to switch the relay between Radio-ACC and "open".  I agree that you have too many fuses - it doesn't hurt, but doesn't help.  It looks like you were on the 1-fuse idea before you scribbled out the lines?

Another termination is another point of failure and another complication.  Just run the loads straight from the relays. 

What wire gauges are you planning on using and what are the max amperages you expect the loads to be? 

You can use a SPDT switch using two terminals.  You will have to figure out which terminals are connected when the toggle is in each position.  Usually, but not always, the center terminal is common and might be marked with a "C".  Assume the switch is oriented vertically... usually when the toggle is down, the Common is connected to the upper terminal, and when the toggle is up the Common is connected to the lower terminal.  That is typical but not always true.  Depends on the switch manufacturer.  You should check it with an ohmmeter.  I would connect the ACC+ circuit to the Common terminal and the relay coil to one of the other terminals.  If the toggle winds up being upside down from how you want it, you can just rotate the switch 180 degrees.

actually he is fused three times. The radio acc power should have a fuse in it's run somewhere too. If that is the actual case, I would not worry about fuses on the trigger power to the relays. I would keep the fuses for the main power to the fans and lightbar though.

Thank you all for information!

I didn't notice it earlier, but the way those switches are wired, they will blow the radio fuse when the switch is turned "off."  So, yeah, leave that ground off, otherwise, your SPDT switches are fine.  I use them in place of a SPST when I have them laying around and need a SPST.

Dr. Hess said:

I didn't notice it earlier, but the way those switches are wired, they will blow the radio fuse when the switch is turned "off."  So, yeah, leave that ground off, otherwise, your SPDT switches are fine.  I use them in place of a SPST when I have them laying around and need a SPST.

Yes, i made a mistake. I tought that switch worked that way. But i did research on spst/spdt switches and now I understand.

Sorry for double post, but I have another question.

How can I wire LED diode when i flip the switch(for example fan ON) and led diode turns on and for example lights green. 

I understood that i can make it happen with spdt switch but it works the other way around. Green light, flip switch, fan on, light off