Download the PDF version of this page here

Choosing an Alternator...

Selecting the proper alternator is essential to the life of an electrical system on any vehicle. An undersized or incorrectly installed alternator can cause electrical failures, damage and even fire in some extreme cases. If you have questions about what kind of alternator your vehicle needs, feel free to contact Powermaster at 630-957-4019 or tech@powermasterperformance.com. You can also contact Concept One for questions about your alternator and pulley kits.

• Make a list of your electrical components
• Determine amp draw on each and total
• Select an alternator with more amps than estimated to ensure long life of the alternator
• See our website for additional tips
• Call our Tech Support Line for selection assistance...

Important Stuff
It is important to know that the alternator cannot output full capacity at idle. Also, electrical demands are generally higher at idle mostly due to engine cooling fans running. When choosing an alternator, make sure that the alternator can output enough amperage at idle to cover the electrical demands.
 
Our alternators are shown with both top end amperage and idle amperage.

Available alternators:

Amp draw of common auto accessories:

Useful formulas:

Amps = Watts / Volts

Amps = Volts / 0hms

Charge Wires

• One of the most missed install problems is the proper charge wire.
• The connection between the alternator and the battery is very important.
• An undersized charge wire, especially with high output units or improperly attached terminals, could result in voltage/amperage loss and alternator and wire damage.
• Powermaster (630-957-4019 or tech@powermasterperformance.com) offers charge wires, ready to use, in various lengths with terminals on both ends and a battery terminal boot installed.

Charge Wire Size Chart

Download the PDF version of this page here