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2002 Suburban- battery light blinking in message center with no symptoms #5320690 01/12/20 11:46 AM
Joined: Feb 2006
Posts: 222
N
N Heat Offline OP
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Joined: Feb 2006
Posts: 222
This truck only gets driven a few times a month on random short trips. Yesterday, when I pulled in the driveway, the battery light started flashing. It stays illuminated for about 4 secs at the time.
I hooked up my bluetooth OBDII scanner and I am getting over 13 volts with the truck running. I unhooked the battery with the truck running and I am still getting approx 13V. With the truck turned off, I am getting 12V from the battery. The battery is a Walmart cheapo I bought in November 2019. The truck starts rapidly and I have no symptoms at all.

Re: 2002 Suburban- battery light blinking in message center with no symptoms [Re: N Heat] #5320711 01/12/20 12:29 PM
Joined: Dec 2017
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JLTD Offline
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Sounds like a longer trip is needed for a little more charging time.


"Let’s not pretend like 0w20 is anything but a CAFE required crutch to eek another 1/2MPG" - BLND1

Hers: 2018 Ford Flex AWD EB, dealer fill

His: 2015 4Runner 60k, SS 5w20/Amsoil

Re: 2002 Suburban- battery light blinking in message center with no symptoms [Re: N Heat] #5320736 01/12/20 01:02 PM
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junk1020 Offline
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That particular alternator is controlled directly from the PCM. Assuming the engine is a 5.3, the gray wire going into the regulator plug is the wire the processor uses to control the field duty cycle, and the brown wire is what the regulator uses to tell the processor to turn the battery light on. Basically a module, telling a module, to tell a 3rd module to turn on a light. Best way to really diagnose it is with a full function scan tool, as you'd be able to see what the processor is commanding the alternator to do, as well as whether the battery light is being commanded on or not, as well as the voltages at both the processor and instrument cluster. That being said, long story short the problem is likely in the alternator. We've seen a bunch of aftermarket rebuilds for those that will charge just fine but the battery light will always be on, switched to a different brand and everything works fine.


2011 Hyundai Sonata, Castrol Edge 0w40, Hastings LF565
2017 Toyota Sienna, Castrol Edge 0w20, Fram TG9972
Re: 2002 Suburban- battery light blinking in message center with no symptoms [Re: junk1020] #5320767 01/12/20 01:44 PM
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Originally Posted by junk1020
That being said, long story short the problem is likely in the alternator. We've seen a bunch of aftermarket rebuilds for those that will charge just fine but the battery light will always be on, switched to a different brand and everything works fine.


Thanks for the tips. This particular alternator is a reman. thats about 8 yrs old. Ill prob just run it until an actual symptom pops up.

Re: 2002 Suburban- battery light blinking in message center with no symptoms [Re: N Heat] #5320776 01/12/20 01:55 PM
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dogememe Offline
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First of all, never disconnect the battery on a modern computer controlled vehicle.

Second, your alternator is probably bad. Have it tested at a parts store. Takes 2 minutes. Pay attention to the ripple measurement!


2010 Ford Escape 2.5 ~102K Miles: Castrol Magnatec 5W-20, Wix Filter.
2001 Chevy Suburban 5.3 ~290K Miles: Valvoline Maxlife 10W-30, ACDelco Filter.
Re: 2002 Suburban- battery light blinking in message center with no symptoms [Re: N Heat] #5320800 01/12/20 02:22 PM
Joined: Jun 2008
Posts: 6,111
ls1mike Offline
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I had this in my old 2002 2500HD.

There is actually a second circuit for the light as described earlier. My original alternator charged just fine, but the light was doing that.
The problem like said earlier is in the alternator. I replaced mine because, one it drove me crazy and two I towed a lot with it and didn't
want any lights on, on the dash.

You can swap it or run it until it no longer charges.


Mike
00 Trans Am WS6 5.7 LS1
17 Silverado 3500HD 6.0
14 Caprice PPV 6.0
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