No electrical power whatsoever

Did anything recently occur that may have caused this issue? (jumper cables?) This may be relevant.

I am sure this maybe a review, but it worked well for my niece's boyfriend maybe three weeks ago.

His checking things was not quite as in depth as it should have been!

I sent him this same link.

https://www.2carpros.com/questions/1996-chevrolet-tahoe-wont-start-sounds-dead-battery-jumpbox-get-same-reults

Many times it is the simple things that are overlooked.

Return with answers/or good news!

The Medic

Rechecked everything that I mentioned in my previous link? Like manhandling the cables/ clamps/ connections.

Let's check these fuses

Actually pull them out, run a continuity test thru them if you have a voltmeter.

Below, found in the central junction box

Fuse Amp

10 20

26 20

101 30

24 15

32 15

The Medic

Measure the battery voltage at the battery cable to the terminal in the relay box. If you do not have battery voltage then do a voltage drop test on the battery cables to check for high resistance. Using a volt meter measure the voltage from the positive terminal at the battery to the cable and from terminal cable to the relay box terminal. The positive lead on meter should touch the battery cable terminal and negative lead touch the terminal on the cable at the relay box. Normally you should read 0.02 volts but under 0.5 should be ok.

Do the same with the ground cable. If readings are higher then normal then the fault will be in the area with high voltage. Here is a link on how to do the test.

https://www.youtube.com/watch?time_continue=193&v=xerAp9Yd53Y

Let us know how it goes.