Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Hey there, thanks for the question.
So you actually checked the charge rate at the battery from the alternator with the vehicle running?
The meter fuse (fuse 25) has quite a few things in the circuit. The meter itself, shift lock, back up lamps, cruise control system.
The way to determine the short there would be to disconnect the meter and back up lamps then replace the fuse. If the fuse does not blow then plug the meter and the back up lamps one at a time and see which one causes them to blow, to see which one is at fault. If it blows both unplugged then it's one of the other components (cruise or shift lock). You can perform the same test with them.
if the alternator is draining the battery, then the one way diode in the alternator is bad. You need a new alternator.
Did you hook the battery terminals up backwards or something when installing the new battery or alternator? I have seen that cause the diode to fail.
I understand the battery is new, but even new or rebuilt alternators can have shorted diodes that will drain your battery quickly.
Do you have a meter? multimeter?
well for starters if the alternator is putting out nothing, then it's either not hooked up properly or bad. That doesn't mean it's draining the battery by causing a parasitic draw. To determine that you would need to disconnect the battery negative and put one lead on the battery post and the other on the cable terminal to measure the amperage draw. If the draw is large you disconnect the alternator and see if it diassapears. That would confirm if the alternator was draining the battery. If the alternator is not charging thats different.
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I would start by double checking your alternator though, since it happened after replacing it and the charge light in the meter is powered by the same fuse.
do make sure the ground wire is connected properly and that your not grounding off the alternator housing or something.
also check the 75a fusible link and fuse 31 as well which provides power to the small white wire at the alternator. if they are bad either one it won't charge at all.
if it shorted previously, then you need to inspect the yellow/red wire from the alternator to the SMJ, it could be shorted. If so it will blow the fuse immediately.
fuse 31 is the charge fuse (10a) next to the cooling fan fuse (30a) under hood
super multiple junction. the big junction next to the interio fuse panel under the dash. just follow the wire from the alternator, the short is likely near the alternator itself.
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