Alternator Electric Test

How to properly test an automotive alternator and how it works. These video details the operation of a typical alternator using CG animation. (note: the following is NOT a sales pitch. We allow all schools and training institutions to use our software free of charge, so long as it is not sold to others. You're encouraged to download our free automotive simulation software for more information.

Category:

Autos & Vehicles

Tags:

• automotive alternator
• alternator
• auto electrical
• auto electronics
• auto repair
• auto training
• auto diagnostics
• auto
• automotive
• auto electric
• electric
• training
• HowTo
• car
• car electric
• cars
• engine
• mazda
• nissan
• volkswagen

[nobleheight]

When measuring diode ripple, should the multi-meter be set to ac voltage or dc voltage?

[ADPTraining]

Good question. You should use an Oscilloscope to measure ripple. Set the scope on AC, this way you're blocking out all the DC. Ripple on alternators is always DC or Direct Current with an AC component. So, block the DC, expand the voltage scale on the scope and concentrate on the AC part.

It is very difficult to use a MM to determine alternator ripple. Most automotive alternators use 3 diodes. Using the scope and a little practice you'll quickly spot a defective diode.

[ADPTraining]

Transient voltage. It's a process patented by Medtronix to test battery condition without placing a load on it.