engine fan thoughts electric vs stock

Fabrik8 said:
Disconnecting a high current inductive load is pretty brutal, usually much worse than connecting. Depends if the fan or relay has flyback/clamp diode built-in to clamp inductive kick.
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And THAT will burn up all sorts of shit. Good point, and one that's often overlooked.

I wonder how many people burn up radios, PCMs, ignition boxes, etc, and don't ever consider that their junkyard electric fan might actually be the culprit.....
 
Factory replacement yj alternator, not sure of specs. I have no idea the output capacity. My voltage numbers above are not accurate. My gauge reads below actual voltage, typically by 2-3 volts, don't know why, always has. My point in the voltage drop on the gauge, was more about the additional load on alternator.

I attribute the failure of the Taurus fans having more to do with having over 200k miles on each of them. All of the Taurus fan failures I've had were the bearings.

All junkyard pulls except first one. It came from a forum member in Raleigh.

My next try is going to parallel relays as mentioned. What about a 100amp continuous duty relay, like a glow plug relay, or continuous duty starter solenoid or high speed?

Higher under hood temps have a correlation to the hi speed relay failure, not run time, start up/shut down, or coolant temp.

I'm almost positive I have the relays on individual 40a fuses. I know the amp draw at startup is way beyond 40, but never kills the fuse, usually the relay.

Every time that the relay has failed, I have low speed on, engine at 210-220 switch to hi speed, fan runs for a few minutes temp comes down to 190 or so, I look down again, I'm at 230 and no power to hi speed. All of these are when there is a lot of heat soak in the engine bay.

Wired with on-off-on toggle switch.

I have led indicators after the relays to show me when the fan is actually receiving power, not just on with switch.

Never seen a water pump last 100,000 miles, or did I miss the sarcasm font?

Still have way more time and money in the Taurus fan, wiring, and troubleshooting, than the cost of a mechanical fan, clutch, and shroud, especially considering the minimal hp gain, and reduction in reliability and dependability.
 
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I've had a Taurus fan in my TJ since about 2005. I'm on the second fan because I dropped it on a concrete floor when I was changing some stuff out. I also have about a 1.5-2v drop when it comes on, but then levels back out when the fan is up to speed. Stock TJ alternator. In fact, I believe it's the original 2000 TJ alternator, haha.
 
My stock water pump lasted 163,000 miles. No lie. It was only replaced because I built a 6.0 to replace the 4.8.
 
I dig the 2 speed taurus fan. low speed for normal use and have a switch to manually kick it up to high speed when I need a boost to help with cooling the trans cooler. since I tow alot with my CJ thats kind of important. my PCM turns on Low as it should for an LS variant. the cool thing is unhooking it for water crossings and whatnot. but I didn't have room or a way to hook up a mechanical anyway. the trick is a relay setup that only permits one circuit at a time. also much much easier to build a proper shroud that doesn't get eaten when you torque the motor in the frame. them yota boys won't benefit from that aspect...
 
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