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A friend of mine has a 93 Daytona ES na 2.5L Auto. He has an aftermaket voltage guage (wired to the output side of alternator) and this past week the needle on the guage started "bouncing" rapidly from 10-14 Volts (The factory guage bounces back and forth as well). We thought the alternator was going bad so he went ahead and replaced it with a brand new one. However even with the new alternator its doing the same thing. He brought it over and I checked the voltage with my meter and with my probes directly on the alternator outputs it only fluctuates from 13.40-13.80 Volts with engine running/headlights off and with "everything turned on" 13.60-14.10 Volts. Then we figured since we had a spare ECM we would swap them out to see if maybe the regulator was going bad but only found the same problem is occuring.
I had this similar problem with my race car a year ago just before the alternator quit working and then a similar situation earlier this year when I had to replace my ECM. Could this possibly be another bad alternator or possible wiring issue?
I had this similar problem with my race car a year ago just before the alternator quit working and then a similar situation earlier this year when I had to replace my ECM. Could this possibly be another bad alternator or possible wiring issue?