black85vette: took your advice. pulled the cables, cleaned them, put them back on. Now the voltage readout changed from 9.9v to 9.8v. The battery is actually reading 12.8v using a VOM.
'86 coupe digital dash problem
My battery went dead on my '86 coupe. After jump starting it, I noticed the digial volt readout was 9.9v, the coolant temp was 172deg, the oil pressure was 72lbs, and the oil temp was 125 degrees. I charged the battery to 13.2v (using a battery charger), the car starts and runs great, but these digital readouts haven't changed. All the other readouts seem to be normal---tach, speedometer and gas gauge all work, as well as the average & instantaneous mileage. Also, when I change the readout from volts to coolant temperature, the readout changes then immediately goes back to 9.9v.
any ideas what might be causing the problem??
thanx
any ideas what might be causing the problem??
thanx
1 - 4 of 8 Posts
Mine is a little different than yours. I checked my alternator output and it was 14+v. I also fully charged the battery and the digital readout stayed a 9.9v.
Whats strange is that, today, I pulled the negative lead off the battery and left it off for about 4 hours, hoping that the computer would reset itself. When I reconnected the negative, the digital readout increased to 18.4v. Since its still out of range, I continue to get to 175degree coolant temperature reading.
Whats strange is that, today, I pulled the negative lead off the battery and left it off for about 4 hours, hoping that the computer would reset itself. When I reconnected the negative, the digital readout increased to 18.4v. Since its still out of range, I continue to get to 175degree coolant temperature reading.
I'm starting to lean towards a bad ground. If you read my previous post, I'm now seeing 18.4v after removing the negative lead from the battery for 4 hours.Bad ground somewhere. I had similar trouble and replaced the negative battery cable and the trouble went away.
Do you think a bad ground would also effect the readings for oil pressure/oil temperature? Both of these remain as constant readouts also.
1 - 4 of 8 Posts
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