Dash Volt meter often lies because has many connection to the car that have problems.
Dash Meter Pegs could be meter has loose wiring, bad meter or have real problems... Test at the battery is good.
If has real problems w/ high volts then the ECM often trips codes and CEL turn On.
| quote | Originally posted by Dennis LaGrua: As above check connection and read acoss the battery with a VOM. A reading of 14-14.5V at start cold idle is OK but it should return to around 12-12.V at road load. Should be easy to solve. |
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not quite
Meter at Battery and many other places in the engine bay...
~ 14 to 15v max w/ Engine Running
engine off and battery @ full charge should read 12
.6 to ~ 13
.0
Battery charge can vary depending on many things...
Assume a good battery... 2 big items
when the car driven last. a day or two or a week or more matters. (Because ECM etc use some power 24/7.)
how long the engine runs. Takes some time to charge, more so when have a low charge battery.
If you measure volts in the cabin or front of Fiero... often see lower volts because of iffy wiring and grounds on top of small volt drop in every connection.