Skip the auto shop - Our mechanics make house calls

Q: Deciding which alternator to use. Based off brand.

asked by on
  1. Do any brands in particular produce more efficient alternators than others?
  2. Does more or less resistance increase alternator efficiency?

Some brands are definitely better than others. Denso, Remy, Hitachi, Bosch, Nippendenso and more are just a few quality brands. You didn’t include the year, make and model of your vehicle so I can’t say which one I would recommend for you specific car. I will say cheaper is generally a really good indicator of quality in the auto parts arena.

Efficiency is affected by resistance in all electrical systems. The idea of efficiency must be taken into context of the action that the electrical component is designed to do. In the context of an alternator, output simply needs to output enough to current to meet the needs of the vehicle. The details surrounding this can be complex, so I won’t go into them. Not to mention, reliability of cheaper units are definitely not as good as more expensive brands. Reliability is paramount to efficiency in the alternator world and efficiency is fixed in such an electrical generation system. Again, this is a complex discussion, so I wouldn’t worry about alternator efficiency, buy based on reliability.

If the resistance you are speaking of is because of bad connections at the battery or other connections, these connections should be cleaned and the surface should be cleaned with sand paper. This will give electricity what it desires to flow more easily. Bad connections increase resistance and this causes other problems the affect the efficiency of the power system as a whole.

If you need an alternator, I recommend booking an appointment with one of your fine technicians and they can provide you with a quality unit. I recommend the following inspection to help you out. Alternator replacement

Good luck!

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: No power to the ignition.

When hooking up the battery cables backwards, the polarity of the voltage is reversed and will cause the fuses to pop, the alternator to burn out the regulator, and the computer (ECM) will burn up the ground circuit inside the...

Q: My alternator is overcharging to about 14.8-15 volts. Can that cause other warning lights to come on?

Hi. Yes, in a lot of cars when the battery is low or the charging system is malfunctioning, the ABS Light, Brake Light and the Traction Control Light will come on. This happens because these systems must have the correct...

Q: Car shuts off while idling

Hello. This can be caused by many things on this vehicle, but the most common one is the crankshaft position sensor. I have seen many of these fail on this car and cause this. I usually use a scan tool...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...