Why power has gone out to everything except frnt wipers and speed/odometer?

RTICE10

MEMBER
2003 CHEVROLET TRAILBLAZER
114,000 MILES

Have an 03 chev trailblazer ext inline 6, has lost all electrical power inside except odom/speedometer and wipers, windows/locks a/c radio, dvd etc. All out, fuses are not blown and relays are fine at both boxes, what else would cause this? Think it happend to pryor owner as fuses had been replaced with ones of higher amperage.

8 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

First, put fuses back with correct amperage.

Is there power at the fuse box to the fuses?

Roy

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Tuesday, September 18th, 2012 AT 11:13 AM

KHLOW2008

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41,814 POSTS

" has lost all electrical power inside except odom/speedometer and wipers, windows/locks a/c radio, dvd etc. All out, "

Your question overlapped at the above so I need to know exactly what are working and what are not.

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Tuesday, September 18th, 2012 AT 11:14 AM

RTICE10

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KHLow2008, thanks for your help, the trailblazer has power everything doors/windows, seats/mirrors, dual climate front and rear, dvd, etc. NOTHING works, NO power to anything. The only things that DO work are the drivers gauges, speedometer, odometer, fuel, tach, oil pressure and battery all fine. The gauges would also illuminate when headlights turned on but they too quit working last night. Again fuses and relays are fine.

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Tuesday, September 18th, 2012 AT 2:26 PM

KHLOW2008

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41,814 POSTS

You mean your vehicle is equipped with those accessories and none of them work or you have tested them for power supply which are available but they can't work?
Do the headlights work when turned on?
Is the horn working?
Is the A/C blower motor working?
Are you able to crank or start engine?
Have you checked the battery connections, especially the ground cable between battery negative terminal and transmission/engine?

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Tuesday, September 18th, 2012 AT 2:37 PM

KHLOW2008

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Have you tried checking for trouble codes?

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Tuesday, September 18th, 2012 AT 2:38 PM

RTICE10

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3 POSTS

ASEMaster, will replace fuses back to correct amps (since I bought all new ones before I even checked old ones anyway). Have power at box underhood, will check box under seat to be sure, just assumed it did. Will let u know if thats it, but feel free to let me know what I should troubleshoot next! Any input is greatly appreciated!

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Tuesday, September 18th, 2012 AT 2:59 PM

KIM1966

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1 POST

I have a 2008 Trailblazer, driving along, and I lost power to my radio, dash lights, power windows, power locks.
So after my brother scratched his head for a day, and checked the fuses for those areas, he checked grounds, and the wiring for obvious cracks or disconnections. He decided to pull every fuse in both fuse boxes.
Success! And a mystery at the same time! He pulled one that was named "trailer" on the fuse box diagram that was in the under the hood fuse box, and it was blown. He swapped it out, and everything started working again.
We are confused on this, probably just as much as you will be reading it. But it's Gods honest truth!

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