Phoenix77
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save your money, fans are worthless and do more to increase temps due to blockage.Just traced the wire farther; went out to engine compartment and has power spliced off the light switches. Probably an IR light, as @Retiredwarhorses noted.
Perfect for my use, since I am installing two (2) supplemental fans under the grille to help keep the operating temp down.
Just need to verify 12v or 24v before connecting.
For RAWL Rotating Amber Warning Light, all our vehicles, from M1025 HMMWV to M125A2/M106A2 Mortar Tracks had them in Berlin.On my rig... it controls the flashing beacon light.
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I would use that switch to manually turn the factory fan on. I added a switch to mine that just breaks the circuit between the temp switch and the fan control module. fan runs continuously and cools things down even in AZ heat in trafficI did a full cooling system flush when I first got the M998. It will get to 220° and the fan kicks on as long as I am moving.
I switched away from the armored grille and it helps. If I'm creeping along in a parade, the fan doesn't kick on, and it will go north of 220.
These fans are to bring it down in those instances.
If cooling system is working correctly, cycling as is should... what would the need for a bypass / over ride switch. Worst case hot or broken it should run.I would use that switch to manually turn the factory fan on. I added a switch to mine that just breaks the circuit between the temp switch and the fan control module. fan runs continuously and cools things down even in AZ heat in traffic
Some people don't like hearing it go back and forth between fan on and off due to the change in noise level, but other than that I don't see any reason.If cooling system is working correctly, cycling as is should... what would the need for a bypass / over ride switch. Worst case hot or broken it should run.
Hear in the Mojave Desert, highway or trail never worried about over temp condition. I note... any sludge up, plugged, rusted, busted, leaking component/s all bets are off.
Thinking and wondering, CAMO
I get what you say and no issues on build it your way. For me... it is the heartbeat of the HumV. If I don't hear it roaring something is UP. On the same DIY mod's, I have a light that comes on when the fan is engaged. (came off of heater. moving the brake lamp to the center was a good idea too. Was always hiding behind the steering wheel. That's it from this peanut vendor.)Some people don't like hearing it go back and forth between fan on and off due to the change in noise level, but other than that I don't see any reason.