Hayden 3680 electric fan

[Sly_Jeeper]

What size fuse should i use inline? Simple ground to battery ground, positive coming from battery with fuse holder inline and a switch by the grill? It blew a 10 amp fuse thanks guys

 

 

1989 4.0

Renix

Scratchy Ba/10

2wd

Stock

Short bed base

[AZJeff]

The fan specification should tell you the current draw or the power draw (in watts).  Take the wattage and divide by twelve (battery voltage) to determine current draw.

 

Caution—startup surge current can be much higher than steady state current.  Take the steady state current and add 25-30% to that when selecting a fuse.

 

actually, I prefer self-resetting circuit breakers over fuses for cooling fans.  Nothing sucks more than to be stuck by the side of the road because your fan won’t run because of a 25 cent fuse That failed due to fatigue.

[Sly_Jeeper]

Thanks for the information and the tip


1989 4.0
Renix
Scratchy Ba/10
2wd
Stock
Short bed base

[yxmj]

If this is the fan....

https://www.summitracing.com/parts/hda-3680

It says it would only have a 8.8 amp draw.

If you blew a 10 amp fuse why not try just going up to a 15 and see if that is enough

[Sly_Jeeper]

If this is the fan....
https://www.summitracing.com/parts/hda-3680
It says it would only have a 8.8 amp draw.
If you blew a 10 amp fuse why not try just going up to a 15 and see if that is enough

I will be trying that today thank you. Hopefully this helps with little heat at idle


1989 4.0
Renix
Scratchy Ba/10
2wd
Stock
Short bed base

[JustEmptyEveryPocket]

1 hour ago, yxmj said:

If you blew a 10 amp fuse why not try just going up to a 15 and see if that is enough

An important aside to this: What size wires are you running? Don't up the fuse rating until you know FOR SURE that your wires can handle the load. Asking for a bonfire if this gets messed up.

 

And my apologies if you already thought of this. I felt it had to be said, just in case.

[AZJeff]

On 7/23/2020 at 10:35 AM, JustEmptyEveryPocket said:

An important aside to this: What size wires are you running? Don't up the fuse rating until you know FOR SURE that your wires can handle the load. Asking for a bonfire if this gets messed up.

 

And my apologies if you already thought of this. I felt it had to be said, just in case.

VERY good point.   If you put in a large fuse, yet use (relatively) small guage wires, you wind up using the wires as the fuse element.

[Sly_Jeeper]

An important aside to this: What size wires are you running? Don't up the fuse rating until you know FOR SURE that your wires can handle the load. Asking for a bonfire if this gets messed up.
 
And my apologies if you already thought of this. I felt it had to be said, just in case.

The wires are 12 gauge, i am using a 15amp fuse now and has not blown. Do y’all think maybe i should use bigger wires?


1989 4.0
Renix
Scratchy Ba/10
2wd
Stock
Short bed base

[AZJeff]

Let’s go back to specifications—what is the STEADY STATE draw of this fan you have chosen?

 

Then add 20% for start up surge current to figure out peak current.

 

Now how long are the wires from the 12v source to the fan motor?
 

Now figure out the voltage drop for a given wire gauge and wire length using the below simple calculator:

 

https://www.rapidtables.com/calc/wire/voltage-drop-calculator.html

 

you want your voltage drop to be 0.25vdc or less, so adjust your wire gauge accordingly.

[Sly_Jeeper]

Let’s go back to specifications—what is the STEADY STATE draw of this fan you have chosen?
 
Then add 20% for start up surge current to figure out peak current.
 
Now how long are the wires from the 12v source to the fan motor?
 
Now figure out the voltage drop for a given wire gauge and wire length using the below simple calculator:
 
https://www.rapidtables.com/calc/wire/voltage-drop-calculator.html
 
you want your voltage drop to be 0.25vdc or less, so adjust your wire gauge accordingly.

I think ive got this in here right


1989 4.0
Renix
Scratchy Ba/10
2wd
Stock
Short bed base

[derf]

Current type should be DC.

[Sly_Jeeper]

Current type should be DC.

Thank you, it turned out to be 0.13


1989 4.0
Renix
Scratchy Ba/10
2wd
Stock
Short bed base

[zomeizter]

Go overkill with the leads if you have them...