Charge & abs light intermittently on
#1
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Charge & abs light intermittently on
The past couple days I've noticed my charge & abs lights flashing intermittently. Today was more consistent than yesterday.
I don't have a voltmeter to test different points at the moment so I'm just kind of spit balling for now. However, I do have a PFC so I changed the screen so I could watch the volts.
Car starts fine with no problems. PFC reads 11.9-12 volts. If I turn on the a/c the volts drop down to 11.5 and the charge & abs lights come on. If I roll down both windows, voltage drops to 11.6 & lights on again. If I turn the a/c off the volts will go back up to 11.9/12 after a few minutes. If I hit the brakes, same thing, voltage drops to 11.6 & lights back on. Wait a few minutes and the voltage is back up and everything is ok.
I checked the belt and tension appears to be good. I've got the battery on charge at the moment. Battery is new, has less than 500 miles on it. It is a 35R battery. I'm not running any crazy audio system, just an aftermarket headunit.
What should my voltage reading be on my pfc when idling? I couldn't find an idle voltage in the manual. I'm sure it is there, I just couldn't find it in my searching. Should the voltage drop .5-.6 volts when running the a/c, hitting the brakes, rolling down the windows?
Thanks!
I don't have a voltmeter to test different points at the moment so I'm just kind of spit balling for now. However, I do have a PFC so I changed the screen so I could watch the volts.
Car starts fine with no problems. PFC reads 11.9-12 volts. If I turn on the a/c the volts drop down to 11.5 and the charge & abs lights come on. If I roll down both windows, voltage drops to 11.6 & lights on again. If I turn the a/c off the volts will go back up to 11.9/12 after a few minutes. If I hit the brakes, same thing, voltage drops to 11.6 & lights back on. Wait a few minutes and the voltage is back up and everything is ok.
I checked the belt and tension appears to be good. I've got the battery on charge at the moment. Battery is new, has less than 500 miles on it. It is a 35R battery. I'm not running any crazy audio system, just an aftermarket headunit.
What should my voltage reading be on my pfc when idling? I couldn't find an idle voltage in the manual. I'm sure it is there, I just couldn't find it in my searching. Should the voltage drop .5-.6 volts when running the a/c, hitting the brakes, rolling down the windows?
Thanks!
#3
I'd get the alternator tested, as the alternator should be putting out greater than 12v while the engine is running, more to the tune of 13.5-14. All of those things you mentioned will cause the volts to drop, and .5-.6 volts sounds correct, but it's more noticeable since your alternator isn't pushing enough voltage to begin with. Also, it couldn't hurt to check your grounds while you're at it.
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I think you have a bad diode in your alternator. If normal is 13.5 to14 v then one bad diode would take you down to 11.66 or 11.16v. So your abs and charge lights would start to light up.
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Put a wrench on the alternator pulley bolt and make sure it isn't slipping. My catch can once got a little too full, and sprayed a little oil on the belts. It wasn't enough oil to be visible, but it was slipping.
You may not have a catch can, but FDs are well known for holding their oil.
You may not have a catch can, but FDs are well known for holding their oil.
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rgordon1979
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