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Old 11-10-2019, 07:24 PM   #62875
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Quote:
Originally Posted by soundman98 View Post
sounds like it needs a battery maintainer.

what year are you working on? i'd start with the ecm fuses, and then move to anything on the interior that has a memory
That's what I was working on today, and couldn't find anything. Going to go through them once again if necessary. Shouldn't need a battery maintainer for 3 to 7 days ( about as long as it goes).

Also, haven't had the issue in the 6 years I've owned it until this past month. 2004 Suburban ZL1.
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Old 11-10-2019, 07:26 PM   #62876
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Quote:
Originally Posted by davesrave View Post
From: https://automedicsafrica.com/cause-o...battery-drain/

PARASITIC DRAIN
If you have your radio presets, security alarms or clocks running after the engine is off, it can drain your battery. The most common causes of parasitic drain are under hood lights, trunk lights, headlights or glove box lights that do not turn off when the door is closed. Relay switches that are stuck in the “on” position can also cause a battery to drain.
FAULTY CHARGING SYSTEM
A faulty or unreliable charging system can also drain the battery while the car is running. When an alternator is not pushing out enough voltage, which should be between 13.5 and 14.5 volts, the battery will drain quickly.
BAD ALTERNATOR DIODE
Alternators with bad diodes can cause battery drain. A bad diode can leak and allow the current to flow in the opposite direction. When this happens, it may keep the charging circuit on after the vehicle engine is shut off, which will cause the battery to drain.
OLD BATTERY
Batteries that are old or have been drained continuously may not hold a full charge anymore. The rule of thumb for replacing a battery is every four to five years.
the first one was a 'yeah dummy' one for me. now i'm suspecting the bad alternator diode.. that's almost as easy to test as fuses-- just pull the cables off the alternator and let it sit a few days.

a faulty charging system would have driveability issues over the course of a few hours as the battery goes dead, and he said he already replaced the battery, ruling both those out.

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Originally Posted by humfrz View Post
Say WHAT?




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those had generators, right? a lot easier to troubleshoot though!
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Old 11-10-2019, 07:33 PM   #62877
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Might check the battery case itself. When did you give it a good scrub up and clean?
Try disconnecting it and test from the neg. over to almost but not quite the pos. on the top.
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Old 11-10-2019, 10:31 PM   #62878
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Quote:
Originally Posted by soundman98 View Post


those had generators, right? a lot easier to troubleshoot though!
Yes, they had generators. But, if a voltage regulator is working properly, how could a generator cause a parasitic drain on a battery?




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Old 11-11-2019, 12:02 AM   #62879
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Quote:
Originally Posted by humfrz View Post
Yes, they had generators. But, if a voltage regulator is working properly, how could a generator cause a parasitic drain on a battery?




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in the great words of AvE, batteries are angry pixie containment devices. alternators are angry pixie movers. sometimes, the pixies get angrier than the movers or the containers are designed for!
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Old 11-11-2019, 12:13 AM   #62880
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Originally Posted by Dadhawk View Post
That's what I was working on today, and couldn't find anything. Going to go through them once again if necessary.
yeah, i'd definitely try disconnecting the alternator next. but obviously somethings not shutting down. automotive electrical systems have changed a lot over the years-- used to be any load over 0.5A was considered excessive, anything under that was 'normal'. now i'm told some modules can consistently draw less than that when they're running properly. but many rely on signals from other modules before they shut down. lose that signal in any number of ways and the module will continue drawing power until there's none left.

my parents have had a '94 and a '99 (technically a late-production '98), both have had issues with random grounds from time to time rotting out. so if the alternator doesn't show anything, i'd definitely try locating and inspecting the various grounds that are exposed to the elements within the engine bay.

one time, the starter ground came loose, and through whatever voodoo, the shortest electrical path for the power was through the 18 gauge horn wire. couldn't figure it out, tried starting it 3 times, stopped trying when magic smoke came out of the grille-- a long ways from the starter location.

Quote:
Originally Posted by Dadhawk View Post
Shouldn't need a battery maintainer for 3 to 7 days ( about as long as it goes).
agreed, but a maintainer is sometimes easier than tracking down the real issue!
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Old 11-11-2019, 12:41 AM   #62881
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Originally Posted by soundman98 View Post
in the great words of AvE, batteries are angry pixie containment devices. alternators are angry pixie movers. sometimes, the pixies get angrier than the movers or the containers are designed for!
Ahhh…….haaaa! That explains it! -


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Old 11-11-2019, 12:55 AM   #62882
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A salute to all of you Veterans out there.


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Old 11-11-2019, 08:37 AM   #62883
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Originally Posted by soundman98 View Post
....agreed, but a maintainer is sometimes easier than tracking down the real issue!
Thanks for all that. I agree on this as well, if it were more feasible, at least until I could find it. Unfortunately the Suburban lives in the out of doors with no electrical source near it. I'm going to charge it every couple of days until I find the issue.

Alternator test next.
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Old 11-12-2019, 10:41 PM   #62884
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Damn finally working again
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Old 11-12-2019, 10:49 PM   #62885
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Damn finally working again
i was literally about ready to reactivate my nasioc account to start selling some products

this forum has the biggest "will it fit my brembos" posting as well

that was knarly as all get out


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Old 11-12-2019, 11:19 PM   #62886
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What year is it??
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Old 11-12-2019, 11:29 PM   #62887
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What year is it??


doesn't matter, it's too late for most.
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Old 11-12-2019, 11:44 PM   #62888
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Jeez, that was awful. I had to talk to people.
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