Question about 1994 Chevrolet G20

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I have a 1994 g20 chevy van 5.7 and i lost my power windows,speedometer,shifting of the transmission,radio,the fan to blow cold or hot air all at the same time. all my fuses are good and the headlights,power locks and other gauges work as well as engine starts can someone help me troubleshoot this problem

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Well everything but shifting of the transmission points to an electrical problem. What does it do when you try to shift it?

How did you know the fuses are good, did you check resistance?
For the electrical problem you need a voltage meter (voltmeter) or multimeter set to volts DC. Probe, with the fuse out, between ground (chassis steel) and where the fuse was pluged in. One side should show +12VDC, the other will be nothing. If you get the +12VDC, good. If not, there is a problem behind your fuse panel and you'll have to take that all apart to figure it out. (by the way make sure the key is on run, at least, or better yet with the engine running....try different key igniton positives (accessory, off, run) to see if it makes a difference)

If you're getting +12VDC there at the panel, then start checking for voltage elsewhere. Pinpoint where the wiring diagram would normally indicate voltage and there isn't any, there's the problem. Autozone or Advanced Auto or the library will have the manual you need, I recommend a Chilton over a Haynes.

I have this van too. My van is notorious for leaks and a rusted roof. If water got somewhere like the fuse panel slowly it's going to corrode (or short) parts of the panel or wiring.

Check ground wires too (negative are black wires, typically), like near the battery and under the dash to see if something has been broken from the chassis or badly corroded. Clean corrosion with emery cloth or a file then tighten. Antiseize can help prevent this too, it might be conductive as well, I'm not sure.

Hang in there, It can be fixed though, it will just take a little patient and checking under there till you get at the problem. It may be easier to work on it by taking the driver's side seat out, if you find you have a problem under the dash. Or remove the dash, but a seat removal is easier.

I hope this helps you start your troubleshooting. Good luck.

Posted on Apr 24, 2011


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Posted on Jan 02, 2017

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SOURCE: not shifting to 3rd or 4th gear

3 and 4 clutch pac . get it rebuilt

Posted on Jun 02, 2009

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SOURCE: 1994 Chevy G20 Van - Van (auto trans) only has high (D) gear

Sound like you're going to need to drop the transmission pan so you can replace the filter along with fresh transmission fluid. I had a problem like that many years ago, this correct the problem... I also know that the throttle positioning sensor will also cause transmission shifting problems. I would start with the filter change then go from there... Good luck.

Posted on Aug 29, 2009

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