im looking at a 2004 S10 extreme blazer for a friend, and the battery is
going dead on it all the time. sears checked her battery and its ok. i had an
ammeter on it all morning in the garage and when the vehicle goes to "sleep"
i read 15 milliamps. what is the limit for this truck? i work on bmw's and we
wllow 30 milliamps max after sleep mode is assumed.
also, anybody here know any common causes for draw on this truck? i heard
somebody say the radios are prone to problems, and my friend did say that if
she turns off the radio before shutting off the truck and locking it, the
battery will not drain
Message posted via CarKB.com
That seems to point to something...
I had not heard anything about the radios though. Never heard there was any
problem with them. It might be worth checking to make sure the radio is
turning off when the doors are opened.
Please disregard the previous blank message.
I have had a lot of problem with GM as far as running down the battery with
spurious current drain.
Some of those GM radios keep running, even though you turn the key off,
you open the door. Something afoul there might be a first guess. Maybe it
turning completely off, for whatever reason, every time.
Other things I have found are defective seat belt tensioner system,
defective tail light
switch, defective light switches to handle lighting like mirror lights,
glove box lights,
You can use a peak current recording VOM to see if this is happening when
arent really looking. Or just remove fuses and do it by trial an error
find the right circuit.
As far as I know, the signal from the interior lighting system, from the
door switch, is used. It would not make sense to do it any other way, I
The battery drain will have to be above the 15-30 milliamp level to cause
trouble as far as battery discharge is concerned.
These can be darn frustrating things to find sometimes.
wrote in message
No, at least not for that purpose. The pin switch being released when the
door opens turns the radio off.
You can test this (with enough hands!) by leaving a door open, pushing down
the pin switch, turning the key off and noting that the radio will still be
Whatever controls the power going to the radio before the doors open is
external to it. I installed an aftermarket radio in my '03 S-10 and it stays
on until the doors are opened, just like the factory set did. I used nothing
but a wiring adapter that goes from "GM radio plug" to bare wires and the
factory radio is completely gone...it was not relocated elsewhere in the
Most everything goes through the computer now. Switches no longer go
directly to the accessory, but they tell the computer they are no in a
certain position, therefore some instructions should be sent to some
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.