alt Archives - UnderhoodService
New Brands Added To

With these most recent additions, now includes more than 320 brands, covering more than 4,470 part types and millions of applications.

13 Alternator and Battery Testing and Diagnostic Tips

One Test Is Not Enough If only battery voltage is present at the battery on a running engine, does this mean the alternator is “bad?” No, it does not. That only means that the alternator is not charging, but does not reveal why. Therefore, it does not prove a faulty ­alternator. All too often the