2000 Nissan Altima 4 cyl Front Wheel Drive Automatic 112000 miles
I had an alternator failure and replacement. Have had bad MPG and rough idle since. Noticed that coolant temperature gauge (CTG) drops with power request (accel, hill, even increased RPM at rest in neutral). It seems to be an analog response in that more power equals more gauge drop, down to essentially " cold" reading if merging or overtaking on highway. Also had appearance of an intermittent lose of ALL instrument/dash lights (including radio!), Only the lights go, radio, fans, gauges etc. Still work, just in the dark. Hasn't happened recently.
Diags: Alternator (new) puts out 14V to positive term. Of battery and to ground. This does not change (not even a wiggle) when CTG is actively dropping due to high RPM in neutral. No fuses blown.
1. New alternator and its install are source
2. Failure of old alternator did damage and is the source
Trying to replace coolant temp sensor (bad MPG due to wrong input to ECM) and coolant temp sending unit (weird gauge behavior). Anyone got pictures of where these are? Is this worth doing? Is the voltage regulator a possible suspect? (Does the Gen2 Altima even have a voltage regulator, I can't find it!)
Multimeter tests to clarify?
Monday, February 22nd, 2010 AT 11:38 AM