Around 100k on my 97 Tahoe. A few months ago, the following problems started:

1. The interior lights started going on and off all by themselves. Get in the truck to go to work, dead battery because the lights were flashing on and off all night. I tried to check the door switches, but I can't see how in the world you can get to them! So I ended up disconnecting the interior light fuse. I still hear the relay clicking on and off - as much as 5 times a second!

2. ABS light comes on randomly while driving. Also, occasionally, while stopping, ABS kicks in for no reason and makes it difficult to stop - especially while turning. I have read about the dirty sensor but haven't gotten to that one yet.

3. Leaks coolant from the rear of the engine. I know its coming from the rear connection, but ... how to reach it? I can't even see it.

4. Randomly, during acceleration, it slips, like you went into neutral. Tran fluid level is normal.

5. Alternator light flickers randomly while driving. Brand new alternator. Voltage is around 13.78 I think last check. I don't get it.

Any suggestions experts?
Thanks in advance for your advice.

 

Your problems #1 and #4 maybe related, here is the reported modification that may need to be completed to fix the problem:

1. Disconnect the negative battery cable from the battery/batteries.
2. Slide the protective boot on the generator BAT terminal aside and remove the retainer and wire cable from the BAT terminal.
3. Unplug the generator 4-cavity terminal from the top of the generator.
4. Inspect cavity D on the generator connector for a red cavity plug. If a red cavity plug is present, it is not necessary to replace the generator connector. Remove the CPA and save. Remove the red cavity plug and continue with step 9. If a red cavity plug is NOT present, continue with the next step.
5. Remove and save the orange Weatherpack seal and CPA from the 4-way connector.
6. Using the proper terminal removal tool, remove the two or three wires from the 4-way connector. On vehicles without Supplemental Brake Assist (SBA), install a red cavity plug, P/N 12059168, into cavity "A" of the new 4-way connector, P/N 12186568. On some 2003 and 2004 model year vehicles with SBA, install the dark blue (Circuit 5668) wire of the vehicle wiring harness into cavity "A" of the new 4-way connector.
7.Depending on the vehicles model and year, install the brown wire (Circuit 25) or red wire (Circuit 225) of the vehicles wiring harness into cavity "B" of the new 4-way connector.
8. Install the gray (Circuit 23) wire of the vehicle wiring harness into cavity "C" of the new 4-way connector.
9. Obtain a piece of 0.80 mm/18GA black wire, 254 mm (8 in) long.
10. Install a red terminal seal, P/N 12048086, and terminal, P/N 12048074, (crimp and solder) on one end of the new black wire.
11. Install the new black wire into cavity "D" of the new 4-way connector.
12. Reinstall the connector seal and CPA, from the original connector, to the new connector.
13. Plug the 4-way connector into the generator.
14. Route the black wire to the generator BAT terminal, sliding the wire into the small end to the output terminal boot, along side the generator output wire.
15. Obtain a ring terminal from the terminal kit (J-38125-D) that is the same diameter as the positive post of the generator. Crimp and solder the ring terminal from the terminal kit (J-38125-D) on to the open end of the new black wire.
16. Place the generator output wire and the new black wire onto the generator BAT terminal and install the retainer.
17. Connect the negative battery cable.

The transmission need to be looked at by the dealer if you are sure that it is infact slipping and isn’t just extra noise from the thermostatic engine driven fan engaging when it gets hot.

Have the dealer replace the upper plastic coolant line seal to fix the leak.

The ABS light you seam to have a handle on.


Dave