My wife and I have owned three 1994 Sentra cars. One of them went through batteries and alternators like crazy. Last time the 1-year old battery died, I replaced it and went straight to an auto electric shop. The technician found the alternator was putting out about 77 amps the entire time the engine was running (factory alternators are rated for 80 amps, but only when charging nearly-dead batteries). He also found that the harness running to the alternator was hot enough to scald you if you touched it. Miraculously, I found a factory NOS harness on eBay and bought it. Easy to put in, and the car went from a maximum charging voltage of about 13.1 volts, to a MCV of up to 14.1! Haven't replaced a battery or alternator on it since. Hope this helps someone...
My friend is a Honda Vehicle Technican who owns a 1994 Nissan Sentra which had kept dying on him. He had called the AAA driver who stated that the alternator was good as noted on the print out report when the AAA driver ran the check on the system. It turned the alternator was bad, which somehow also affected the starter. While the AAA driver had jump started the car, the ignition switch relay got broken; and the small positive cable connection got a short; so it all, he replaced the alternator, the starter, the battery and got a new battery cable connectors, ignition switch relay and fuse for the inside of the interior lights -- and he has no problems since after spending 4 days on this problem. It would had been easier had he had a lift and the right equipment but nevertheless he got it done but missed his work -- but at least its fixed.
SOURCE: 2002 Nissan Sentra car will not start but battery is 100% charged, will start when boosted though
check your battery cables to see if the cables themselves are corroded and also check the connections where they connect to the vehicle that they are clean
positivecable will connect at the starter and the negative will connect to the engine some where.
if this does not help then have your starter tested to see if it is dragging. as it could be the armature or the brushes in the starter.
SOURCE: nissan serena alternator
You must test first if your alternator produces output voltage (usually about 13.5V)
A test light is a simple but extrememly useful tool.
If you are trying to diagnose and troubleshoot an electrical problem, sometimes a test light can help you rule out possible causes much more quickly and easily than a DMM (Digital Multi Meter)
SOURCE: 97 nissan sentra put new alternator and battery car wont start
are you sure the alternator is good? because it could be tricky ...The only other thing is the wire running back to battery pack to charge battery maybe disconnected
SOURCE: 1996 nissan sentra
Using a short socket of appropriate metric value, and a pry bar; Push the pry bar toward the firewall to loosen the tension on the belt. It's not that hard once you buck the initial spiral spring pressure of the tensionor. I have even pryed against the tensionor with a blunt heavy bar and moved it enough to free a belt.
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