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What does excessive ripple in the alternator mean?

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Posted on Jan 02, 2017

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SOURCE: 2002 dodge stratus alternator problem? Charging

It is obvious that you have an alternator charging problem, diode ripple being high is possible evidence of leaking diodes. I would have liked to know what is going on with the amps doing testing also and the condition of the battery.

Posted on May 29, 2011

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1 Answer

Why do gauges keep flickering on and off at all speeds and blinkers tend to work on and off?


Do the headlamps flicker also ? Possible excess AC voltage ripple from alternator ! Suggest you take it to a ASE certified repair shop an have it checked out . If it is excess AC voltage ripple it could damage complex electronic components , engine computers ,abs modules , instrument clusters , body control modules etc.... Hope this helps .

Aug 23, 2015 | 2007 Chevrolet HHR

1 Answer

What can look for


Power draw causes heat generation. As the alternator is loaded down by current drawn from it, the windings heat up. This is normal, and this is why alternators have fan impellers on them. If you have lots of equipment running, the power draw may exceed the alternator capacity. Modern alternators have overcurrent protection built into them, but this doesn't mean you can't burn them up. Excessive sustained power draw will overheat the alternator and it will eventually fail. The best thing to do is either lessen the load or upgrade the lternator.
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Feb 16, 2015 | 2003 Ford F350 Super Duty DRW SuperCab

2 Answers

What does static in speakers mean?


Put an oscilloscope on the Generator (Alternator)
& look for A/C Ripple

Failed Diodes & a/c riding on the dc current

You have to check all vehicle grounds,That could
take half a day

Pull fuses you don't need to use the radio

Try the radio without the motor running (no alternator)

Their may be a bad diode in the A/C wiring, near the compressor
Try without the air on

Aug 12, 2014 | Cars & Trucks

1 Answer

Excessive ripple in alternator


This would be a sign of leaking diodes and would require alternator replacement to rectify the problem.

Feb 27, 2013 | 2004 Ford Mustang

3 Answers

2002 dodge stratus alternator problem? Charging test shows load voltage at 13.86v and load off at 13.90v . The results also say diode ripple - Ripple detected 0.46v HIGH? What does that mean?


Your not over .5 volt ac on the ripple, which
is ac leakage from the diodes

What started this issue & who is doing the testing
& how.

Don't see an issue from those numbers.

May 29, 2011 | 2002 Dodge Stratus

1 Answer

I'm having the same problem but it comes and goes. I had the altenator test and they said it was fine, It did it again this morning. run fine, then the voltage drops then goes flat, but still runs. I tap...


Have the alternator checked again, It sounds like the voltage regulator is going bad. When you have it checked voltage ripple means alternator is intermittant. Remember just because they sell auto parts does not mean they know how to turn a wrench.

Oct 30, 2010 | 1993 Jeep Grand Cherokee

1 Answer

03 Mazda Protege5 81500 miles idel drops


If you are really thinking that the alternator is the problem have it properly tested. This will test the ripple and the output. If the ripple isn't right then that means a bad alternator. You would have to either take it to a shop to have the test done in the car or take it out and bring it into your general purpose car place, i.e. checkers. It could also be added resistance in your charge back wire to the battery.

Jul 20, 2009 | 2003 Mazda Protege

1 Answer

No charge to from alternator to battery


A diode ripple? The diodes are in the alternator. Is it a new alternator?

Jul 04, 2009 | 1991 Dodge Ram

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