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Hi guys I might have to replace my alternator I have before but it wasn’t the smoothest or easiest to do because of lack of space and also what’s the best way about to go with that tension bracket to loosen the belt and alternator?
 

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I've replaced the alternator on my '98 4-cylinder Frontier, was pretty easy and straightforward.

Disconnect negative battery.
Remove the air hose that is over the drive belts.
Disconnect the wires/harness at the alternator
Loosen the bolt that secures the adjustment (bolt head faces forward).
Loosen the long bolt that serves as the alternator body pivot; you may need to access from underneath, so remove the plastic engine protection pan if you have one.
Loosen the long fully-threaded bolt that is the tension adjuster (bolt head faces right/passenger side).
Pull off the alternator belt, pull the alternator out.
Like they say: installation is the opposite !!!

If you need to replace the alternator belt (not a bad idea), the other belts must be removed first for access. I just replaced all my belts a month ago, two were 10 years old. Good idea to keep the old belts as emergency spares too.

If you're wondering: my replacement alternator (about 5 years ago) came from O'Reilly, and has a lifetime warranty.
 
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