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It works....with one caveat. Dang.

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TR6BILL said:
Got it Steve. Sitting on my work bench, waiting for Friday (my day off) when I can go to the marine electric store to get some good wire and shrink tubing.

On another approach, a buddy gave me a <span style="font-weight: bold">diode</span> (he has a towing service and drag races a Chevy II [made PINKS]). We ran it across a 12 volt field and it passed all the juice through one way and blocked all the juice the other way. Hmmmm. Just an inline setup. Confusing myself.
Click to expand...

Ya can try it, not much to lose. And a simple two splice trial as well. My bet is: it'll work.
 
Here's what you have to do, that diode would have to go in the circuit at the fan, let the air flow over it to keep it cool. The drawback to that is that if it fails, the fan don't run, not even with his manual override switch. To get to the car show this weekend I suggest not going down unknown roads, and just wire it like on the drawing. Next week we can play.
 
ps, can you post a picture of the diode?
 
Should work fine as Steve's setup. :thumbsup:
 
Iputsomuchcaminmyenginesoitrunsreallywellbutitdoesn'thaveanybottomend
andIputareallybigfanonittomakesureitstayscoolbutitwon'tletitidlesoIhad
toputsomethingonittomakeitidlefaster. :crazyeyes:

bumper upper was easier to say.
 
mehheh!

Not to mention all th' pencil lead you save!!! :laugh:
 
71MKIV said:
ps, can you post a picture of the diode?
Click to expand...
diode.jpg

A big sucker. Can carry 40 amps.
 
That thing looks like a transmission mount..........

Is this for your fan or the transformer on the pole outside your house???

Just kidding...good luck.
 
Might be big enough; but don't forget it will need a substantial heat sink for continuous operation. Also don't forget that the mounting stud is hot, so it needs to be insulated from the car body/chassis.
 
Oh yeah, and your fan will turn slower, due to the voltage drop across the diode. Not much, but some.
 
It will be big enough, and the fan won't turn noticeably slower. Mounting is going to be the challenge.

I have heatsinks in amongst my junque pile that will work.

Mount it at the fan, so the airflow will keep it cool. And rewire the bypass switch so that the switch bypasses the diode, an "awcrap get me home" kind of thing.

This calls for some experiments and an infared thermometer.

To me that's next week, and another thread. :wink:
 
The electronics store guy said I shouldn't need a heat sink, especially if I mount it in the way of the breeze created by the fan. Also, I thought about putting some short pigtails on each end of the diode, with soldered bullet connectors (British Wiring type) and sorta insert it in the wire, with enough slack that I could pull the diode if it fails and simple insert a length of wire inline. Again, MacGiver-style. The guy that sold it to me said I might lose a fraction of a volt capabilities at most, impedance?
 
Well, your running at half its capacity, so maybe you wouldn't need a heatsink. The only way to find out for sure is to plug it in and find out. Putting wires on it with bullet connectors would work, and a piece of wire in the road repair toolbox.

Like I said, I would put it out front with the fan, with the diode in the breeze.

What the heck, whatcha got to lose?
 
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