How to Replace Alternator
Learn how to replace alternator with our detailed step-by-step guide. Follow our easy instructions to get it done right.
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0 of 6 steps completedStep-by-Step Instructions
1 Step 1: Diagnose Failing Alternator
Step 1: Diagnose Failing Alternator
Check for battery warning light, dimming lights, dead battery, or voltage below 13.5V when running.
Digital Multimeter
Voltage tester for checking alternator output
2 Step 2: Disconnect Battery Negative Cable
Step 2: Disconnect Battery Negative Cable
Remove negative battery terminal to prevent shorts during alternator replacement.
Battery Terminal Puller
Tool for safely removing stuck battery terminals
3 Step 3: Remove Serpentine Belt
Step 3: Remove Serpentine Belt
Release belt tensioner with wrench or tool, slide belt off alternator pulley.
Serpentine Belt Tool
Lever tool for releasing belt tensioner
4 Step 4: Disconnect Alternator Wiring
Step 4: Disconnect Alternator Wiring
Unplug electrical connector and remove main power cable nut from back of alternator.
Socket Set
Sockets for removing alternator bolts and cable nut
5 Step 5: Unbolt and Remove Alternator
Step 5: Unbolt and Remove Alternator
Remove mounting bolts (usually 2-3), support alternator weight, pull out of bracket.
Breaker Bar
Long handle for breaking loose tight alternator bolts
6 Step 6: Install New Alternator
Step 6: Install New Alternator
Position new alternator in bracket, tighten bolts, reconnect wiring, reinstall belt, test output.
Alternator Assembly
Replacement alternator for your vehicle
Serpentine Belt
New belt if old one is worn or cracked