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workingonit · #75 07-18-2021, 09:43 PM

Quote:

Originally Posted by workingonit

Turns on at 183. Ok. Now for the fuse tap.

Sent from my SM-G955U using Xoutpost.com mobile app

After searching for "switched power" for hours on this forum, I repeatedly saw conflicting statements about what is and isn't a sfe "switched power" circuit to tap into (I didn't want to run afoul of any modules). So I decided to look for the uninstalled flashlight charging circuit in the glovebox (it was mentioned a couple of times by trusted sources).

There was a black plastic rectangle where the flashlight would've been, so I used a screwdriver and popped it out. Voila', there was the two=prong receptacle, with a brown ground and a black/red? positive (lighting was bad). After testing with my meter, to verify it was switched, I made that circuit my trigger-power source. I didn't have the right fittings for it, so I used Posi-Taps to tap it, then used Posi-Locks to graft it into the wires that my cigarette plug had previously fed (I cut the plug-in with plenty of wire left, for future use).

Now, the key controls the power to trigger the fan in two modes: 1) automatically via the T-switch on the radiator, or 2) manually, via the hidden switch under the dash. However, once the key is turned off, the fan quits (I had wanted it to run another 16 minutes, until sleep mode started). I guess the flashlight circuit sleeps instantly. Good enough for one day's troubleshooting...I'll look for a sleepy circuit at another time.

Meanwhile, while the engine was running to retest the automatic fan, I sealed the Thermo-switch in a temporary plastic container, and ran an emergency charging cable to the underhood jumper posts, in case my battery goes dead and the manual doorkey won't work. I can use a battery charger or even jumper cables to give the battery enough power so I could use the key fob to get inside.

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