Tryin to hook up jensen vn9312 to a gmc 2001 yukon. the sourse light lights up but nothing responds

Question edited for clarity, full 'year maker model'.
Question moved to sub category.

There are at least two fuses that mention it.

GMC Yukon (2000 - 2001) - fuse box diagram - Auto Genius

https://www.autogenius.info > gmc-yukon-2000-2001-f... Jan 1, 2017 - The underhood fuse/relay center is located in the rear of the engine compartment near the brake fluid reservoir. ... WARNING: Terminal and harness .

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Do it again . you'll find the problem

Sounds like a fuse is blown (most likely cause). I would turn the Key on leave the engine off and take a test light and check all of the fuses on the inside of the vehicle. (when testing the test light should light up on both sides of the fuse if it doesn't it is burnt),

turn key to on position, pump gas pedal to floor 5 times and turn off key. start vehilce. Change oil light should flash for 7 seconds and then go out.

Hi. I have posted a procedure below that will help you isolate the actual drain. follow carefully.

Here is the procedure I use to isolate a battery drain. Remove negative battery cable from the battery. Using a 12-volt test light, hook one end to the negative battery post the other end to the negative battery cable you just disconnected. The test light will glow or "light" if there is a drain. If the "light or glow" is faint, that is probably normal draw for the clock or computer. If the "light or glow" is bright, then there is a large drain. That should be corrected. Now start removing and replacing the fuses one by one until the light goes out; that one will be the circuit with the drain. Remember to hold in the button in the door jam for the interior lights.

When my check engine light went on, it was a oxygen sensor

Just reach behind the bumper and grab the light/electrical harness and twist is either way and then it should pull out put in a new 194 bulb and you are set.

under the bumper turn the light socket 1/4 turn and pull out.
bulb should a 194 I think?

water made path to ground making them work when not turned on..now no water and primary wiring for interior lights compromised (since before rain)...must find poor wiring and bad grounds and fix

This means there is a fault in the four wheel drive system, the light reset's each time the key is turned off, then it tests itself after the engine is started, if the fault occurs again the light will come back on.