I have a drain. It’s .594ma just enough to drain my battery over a couple days time. I went through each fuse to eliminate component circuits. The one I pull that kills the drain is the 50 amp “Batt” fuse. I have a feeling it has something to do with my ignition switch because when the key is out of the ignition, I still have power going to some things like my fan and 4wd control And I think my radio. I was wondering if I am on the right path or if anyone had a better idea. I’ve put pile of work into this truck and just love it. 99 4door Tahoe 5.7
Electric problems
- Thread starter TruckR14
- Start date
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Disclaimer: I'm not an electrical guy by any measure so what follows may be bass ackwards. Take it at your own risk.
I'd check the wiring schematics and see if everything that still has power, and shouldn't, share s common switched source and check circuits from there for faults.
I'd check the wiring schematics and see if everything that still has power, and shouldn't, share s common switched source and check circuits from there for faults.
yevgenievich
I'm Awesome
Is the key by chance wore out enough to be easily removed in any position? Might be turning to acc position on the switch in that case
Keys are all firmly affixed in the start and run position. To the best of my knowledge. I’ll check to see if there are any hokey things there and also look at the schematic. I don’t think the Haynes manual has a very good schematic but it may be enough. Thank you
So the key I used this morning was definitely able to come out of the ignition in multiple positions. This truck has like 10 diff keys that came with it. I found multiples of those magnetic boxes underneath the thing. I’ll check other keys later to confirm
yevgenievich
I'm Awesome
Very often if key can come out at any position instead of going to off, it gets turned to accessory power position. And then battery drains.
Reluctanse
I'm Awesome
check any wiring added on from any PO's as well, weird wiring for aftermarket radio, brake controllers... remote starts or alarms, any of that kind of junk.
It sounds like either the lock cylinder is too worn and not staying in place or the switch itself (I assume in the steering column) is faulty. With the key off you shouldn't have voltage to the fan or radio.
east302
I'm Awesome
Checking that 50A circuit’s downstream fuses in the instrument panel block may help narrow it down. See which one stops the draw. Here’s the schematic for a 98, should be close enough for a 99.
PDFs on most year manuals can be downloaded here:
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PDFs on most year manuals can be downloaded here:
88-98 Service Manuals
Over the years I have collected a bunch of GM service literature. Links to PDF Scans of service and STG manuals and a links to the Parts manuals. You'll need the FREE Adobe Acrobat reader to open these files. Get it directly from Adobe here {http://get.adobe.com/reader/} If you're not...
www.gmt400.com
