1995 blazer s10 parasitic draw

I am helping a friend with his 95 4 door S10 blazer.
its been running down the battery when not running.

Truck starts fine when jumped. did a current draw test on all fuses
on the panel next to the drivers door. Nothing unusual with the truck
not running. taking the battery cable off and inserting current meter
showed around 1 amp. way too much draw with the car off.

took off the alternator wires, draw went away. shorted the two lugs
hooked to the alternator together while NOT connected to the alternator,
1 amp draw back. alternator OK.

On the drivers side fender, there is a power distro block that
has 6 or seven wires on fusible links from a central wire from
battery. I unhooked one at a time, and bingo, found one that dropped
the current draw down to Milli-amps.

So, i got that far. I have no manual yet. The cars starts and runs with
this wire disconnected. So, i tried to figure out what does NOT work
to see what this wire controls.

things that seemed NOT to work now. Power door locks (power windows OK),
radio, stop lights, 4 way flashers (headlights and rear running lights
seem OK) interior overhead lights.

I am thinking the door locks area the primary area to check.
What controls the power door locks? the BCM? anyone have a link
for an electrical schematic for a 95 4door S10 blazer?

bob

Bob,
Did you wait long enough between measurements to be sure that all
systems had "gone to sleep"? This may take a minute or two.

If the drain is constant, you are lucky. It will make it a lot easier to
find when you get the schematic.

I had a Regal that did similarly to this, and it nearly drove me crazy.
I finally found it...seat belt retractor relay was activating throughout
the night, leaving me with a dead battery every morning.

Sorry I dont have concise information for you.

bob urz > wrote:
>
>things that seemed NOT to work now. Power door locks (power windows OK),
>radio, stop lights, 4 way flashers (headlights and rear running lights
>seem OK) interior overhead lights.
>
>I am thinking the door locks area the primary area to check.
>What controls the power door locks? the BCM? anyone have a link
>for an electrical schematic for a 95 4door S10 blazer?

Power door locks are the #1 worry, unless you have an electrically heated
driver's door lock in which case it's probably on the same circuit and the
power lock is the #2 worry.

I don't have a schematic BUT I warn you not to believe the schematic in the
Haynes manual. It is.... an artists rendition of what they'd like the
wiring to be like....
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

bob urz wrote:
> I am helping a friend with his 95 4 door S10 blazer.
> its been running down the battery when not running.
>
> Truck starts fine when jumped. did a current draw test on all fuses
> on the panel next to the drivers door. Nothing unusual with the truck
> not running. taking the battery cable off and inserting current meter
> showed around 1 amp. way too much draw with the car off.
>
> took off the alternator wires, draw went away. shorted the two lugs
> hooked to the alternator together while NOT connected to the alternator,
> 1 amp draw back. alternator OK.
>
> On the drivers side fender, there is a power distro block that
> has 6 or seven wires on fusible links from a central wire from
> battery. I unhooked one at a time, and bingo, found one that dropped
> the current draw down to Milli-amps.
>
> So, i got that far. I have no manual yet. The cars starts and runs with
> this wire disconnected. So, i tried to figure out what does NOT work
> to see what this wire controls.
>
> things that seemed NOT to work now. Power door locks (power windows OK),
> radio, stop lights, 4 way flashers (headlights and rear running lights
> seem OK) interior overhead lights.
>
> I am thinking the door locks area the primary area to check.
> What controls the power door locks? the BCM? anyone have a link
> for an electrical schematic for a 95 4door S10 blazer?
>
> bob

If this is a 4.3 engine -

Pull the Power Accessory Breaker A ( Horn/DM)
Connect the fusible link. If the draw is still there it isn't the door
locks or the key-less entry module.

Fuse 13 - radio

Fuse 19 - Transfer case (if electronic shift)

Fuse 7- Auxiliary power outlets

Fuse 1 - Hazard lamps/Brake lights

Fuse 2 - interior lights, rear hatch switch, lighter, keyless entry, mirrors

pull NOT out of my address and drop me a note and I'll give you a link
to a manual with schematics.


--
Steve W.

On Jan 6, 11:52*pm, bob urz > wrote:
> I am helping a friend with his 95 4 door S10 blazer.
> its been running down the battery when not running.
>
> Truck starts fine when jumped. did a current draw test on all fuses
> on the panel next to the drivers door. Nothing unusual with the truck
> not running. taking the battery cable off and inserting current meter
> showed around 1 amp. way too much draw with the car off.
>
> took off the alternator wires, draw went away. shorted the two lugs
> hooked to the alternator together while NOT connected to the alternator,
> 1 amp draw back. alternator OK.
>
> On the drivers side fender, there is a power distro block that
> has 6 or seven wires on fusible links from a central wire from
> battery. I unhooked one at a time, and bingo, found one that dropped
> the current draw down to Milli-amps.
>
> So, i got that far. I have no manual yet. The cars starts and runs with
> this wire disconnected. So, i tried to figure out what does NOT work
> to see what this wire controls.
>
> things that seemed NOT to work now. Power door locks (power windows OK),
> radio, stop lights, 4 way flashers (headlights and rear running lights
> seem OK) interior overhead lights.
>
> I am thinking the door locks area the primary area to check.
> What controls the power door locks? the BCM? anyone have a link
> for an electrical schematic for a 95 4door S10 blazer?
>
> bob

How old is the battery??? Maybe it's on its way out.

On Jan 8, 11:27*am, m6onz5a > wrote:
> On Jan 6, 11:52*pm, bob urz > wrote:
>
>
>
> > I am helping a friend with his 95 4 door S10 blazer.
> > its been running down the battery when not running.
>
> > Truck starts fine when jumped. did a current draw test on all fuses
> > on the panel next to the drivers door. Nothing unusual with the truck
> > not running. taking the battery cable off and inserting current meter
> > showed around 1 amp. way too much draw with the car off.
>
> > took off the alternator wires, draw went away. shorted the two lugs
> > hooked to the alternator together while NOT connected to the alternator,
> > 1 amp draw back. alternator OK.
>
> > On the drivers side fender, there is a power distro block that
> > has 6 or seven wires on fusible links from a central wire from
> > battery. I unhooked one at a time, and bingo, found one that dropped
> > the current draw down to Milli-amps.
>
> > So, i got that far. I have no manual yet. The cars starts and runs with
> > this wire disconnected. So, i tried to figure out what does NOT work
> > to see what this wire controls.
>
> > things that seemed NOT to work now. Power door locks (power windows OK),
> > radio, stop lights, 4 way flashers (headlights and rear running lights
> > seem OK) interior overhead lights.
>
> > I am thinking the door locks area the primary area to check.
> > What controls the power door locks? the BCM? anyone have a link
> > for an electrical schematic for a 95 4door S10 blazer?
>
> > bob
>
> How old is the battery??? Maybe it's on its way out.

bob, ck the light filaments(1157)style, and sockets for shorts,
corrosion or chaffing.

On 1/7/2011 9:34 PM, Steve W. wrote:
> bob urz wrote:
>> I am helping a friend with his 95 4 door S10 blazer.
>> its been running down the battery when not running.
>>
>> Truck starts fine when jumped. did a current draw test on all fuses
>> on the panel next to the drivers door. Nothing unusual with the truck
>> not running. taking the battery cable off and inserting current meter
>> showed around 1 amp. way too much draw with the car off.
>>
>> took off the alternator wires, draw went away. shorted the two lugs
>> hooked to the alternator together while NOT connected to the alternator,
>> 1 amp draw back. alternator OK.
>>
>> On the drivers side fender, there is a power distro block that
>> has 6 or seven wires on fusible links from a central wire from
>> battery. I unhooked one at a time, and bingo, found one that dropped
>> the current draw down to Milli-amps.
>>
>> So, i got that far. I have no manual yet. The cars starts and runs with
>> this wire disconnected. So, i tried to figure out what does NOT work
>> to see what this wire controls.
>>
>> things that seemed NOT to work now. Power door locks (power windows OK),
>> radio, stop lights, 4 way flashers (headlights and rear running lights
>> seem OK) interior overhead lights.
>>
>> I am thinking the door locks area the primary area to check.
>> What controls the power door locks? the BCM? anyone have a link
>> for an electrical schematic for a 95 4door S10 blazer?
>>
>> bob
>
> If this is a 4.3 engine -
>
> Pull the Power Accessory Breaker A ( Horn/DM)
> Connect the fusible link. If the draw is still there it isn't the door
> locks or the key-less entry module.
>
> Fuse 13 - radio
>
> Fuse 19 - Transfer case (if electronic shift)
>
> Fuse 7- Auxiliary power outlets
>
> Fuse 1 - Hazard lamps/Brake lights
>
> Fuse 2 - interior lights, rear hatch switch, lighter, keyless entry, mirrors
>
> pull NOT out of my address and drop me a note and I'll give you a link
> to a manual with schematics.
>
>
Thanks for the links for the schematics
here is what i found so far

Radio/RDO fuse .9A
interior lights .2 amps

found the lighted sun visor on the drivers side had its cover missing,
without the cover, it never shut off. Kind of borked it, but took the
bulbs out. draw gone now there

Have not got the radio out yet to see if that's the other culprit.
When i first put the fuse in, i hear a motor running. I am speculating
there might be a CD stuck in it and the motor on the eject is somehow
causing the draw. Unknown now until its out

Bob