We offer lifetime warranty on labor and one year warranty on parts from date of purchase.  Powder coat is guaranteed for 3 months from date of purchase. 6 month warranty on externally regulated alternators.

Improper installation and/or improper belt voids any and all warranties.  


Customers will be liable for return shipping costs for alternators repaired under warranty.

JS Alternators will cover shipping costs of the alternator back to the customer, of the alternator repaired under warranty, inside the continental 48 united states.

Costs incurred from damage caused by return shipping will be the customers responsibility to pay.


JS Alternators are all custom built to order and are non-refundable.