digital readout problem - 1991

Red73BB · 03-14-07, 06:00 PM

Friends,

My 91 wouldn't start ( dead battery - sat too long ) so I jump started with no problem.

However

The digital readout - speedometer, gas gauge - doesn't read correctly or doesn't display at all.

The digital readout was working just fine before the dead battery. After I jumped it, I took it for a drive and about 10 miles into the drive the problem appeared.

can anyone help? have you seen this before?

Gary

gmjunkie · 03-14-07, 06:10 PM

Quote:

Originally Posted by Red73BB

Friends,

My 91 wouldn't start ( dead battery - sat too long ) so I jump started with no problem.

However

The digital readout - speedometer, gas gauge - doesn't read correctly or doesn't display at all.

The digital readout was working just fine before the dead battery. After I jumped it, I took it for a drive and about 10 miles into the drive the problem appeared.

can anyone help? have you seen this before?

Gary

Make sure that your battery is charged good!!!Remove the neg battery cable for 5 min and reconnect!!! Lets see if this fixes it!!!!

Red73BB · 03-14-07, 06:12 PM

I can do that - what does that do? resets all instruments?

gmjunkie · 03-14-07, 06:14 PM

Quote:

Originally Posted by Red73BB

I can do that - what does that do? resets all instruments?

Reboots the ECM!!! Dead battery's and Jump starting can make a ECM do all sorts of Weird things!!!

Red73BB · 03-14-07, 06:17 PM

Thanks - GM

ECM = Electronic Computer Module?

gmjunkie · 03-14-07, 06:22 PM

Quote:

Originally Posted by Red73BB

Thanks - GM

ECM = Electronic Computer Module?

Electronic Control Module, Engine Control Module,Electronic Command Module, 220-221 just whatever it takes!!!!

gmjunkie · 03-14-07, 06:29 PM

Probly wouldn't hurt to make sure the Pos and Neg Battery cable connections are Clean while your there!!!

Red73BB · 03-16-07, 08:51 AM

GM Junkie

Thanks for the tips, but still the same problem. The dash fades outs or give the wrong info. It was suggest that I change out the fuse because it could be weak. I thought either fuses worked or the didn't. The fuse was good.

Any other suggestions?

gmjunkie · 03-16-07, 09:09 AM

Quote:

Originally Posted by Red73BB

GM Junkie

Thanks for the tips, but still the same problem. The dash fades outs or give the wrong info. It was suggest that I change out the fuse because it could be weak. I thought either fuses worked or the didn't. The fuse was good.

Any other suggestions?

Have your Alternator Checked out, a bad Diode can run the Battery Dead and make the Computer go Bonkers because there is AC voltage slipping past the Diodes!!! AC voltage and DC components Don't Mix well!!

PS Check the Big Red single lead to the Alt,I've seen them corrode where the Eye attached to the wire and cause the same problem!! And it is Very hard to see because it's where the Eye attached to the Wire,not where the eye attached to the Alt. And one more thing CHECK ALL grounds!!!!!!!

Red73BB · 03-16-07, 10:02 AM

Thanks, will do over the weekend.

gmjunkie · 03-25-07, 06:49 AM

Quote:

Originally Posted by Red73BB

Thanks, will do over the weekend.

Any Luck here??????

Red73BB · 03-26-07, 01:39 PM

Junkie,

Luck yes!

Every thing I checked , all looked things good which led to more fustration.

I went to a ride yesterday and after hitting a hole in the road, the display is now back 100% bright.

So I have a lose wire somewhere, but at least I'm know the problem, now it's just fixe it!

gmjunkie · 03-26-07, 03:03 PM

Quote:

Originally Posted by Red73BB

Junkie,

Luck yes!

Every thing I checked , all looked things good which led to more fustration.

I went to a ride yesterday and after hitting a hole in the road, the display is now back 100% bright.

So I have a lose wire somewhere, but at least I'm know the problem, now it's just fixe it!

It's gonna be a Ground somewhere!!!