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Chevrolet Silverado 1500 Classic LT: I have a 2005 silverado.

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I have a 2005 silverado...
I have a 2005 silverado. It's set up with trailer brake controller. I noticed I was getting no activation on my brake controller. I them checked for all other brake lights. I had none. I bought the brake light switch and replaced it. I had previously replaced the pig tail that comes out of it. Before replacement i would get brake lights when pedal was almost to the floor. Now nothing. If I manually activate my trailer brakes I have lights. Any ideas?
Submitted: 1 year ago.Category: Chevy
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Answered in 15 minutes by:
5/9/2016
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
CHRIS ZAPANTIS
Category: Chevy
Satisfied Customers: 159
Experience: AUTO TECH at G&M EXXON
Verified
did you properly adjust the brake light switch?
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Customer reply replied 1 year ago
How is that done?
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
give me a minute
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
by pushing it all the way in with the brake pedal down then release pedal and it will push it to where it needs to go
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Customer reply replied 1 year ago
I just tried that. It did not make a difference
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
ok do you have a dvom?
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Customer reply replied 1 year ago
A cheap one, yes
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
also can you get me the VIN?
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Customer reply replied 1 year ago
1GCEK19B05E144815
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
cheap is good lol
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
gimme a minute i will pull up diagram for brake lights
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
is the third break light working?
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
orange wire pin b of brake light switch is ther voltage?
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
make sure key is on
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Customer reply replied 1 year ago
Key is on, no third brake light
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
ok orange wire at pin b of break light is ther voltage? how much?
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Customer reply replied 1 year ago
Sorry for not understanding, how exactly do I check that with the harness plugged in
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
go in throught the back of the connector or pierce the orange wire
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Customer reply replied 1 year ago
The most it seemed to show was.02
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
oh oh no power to switch
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
check veh stop fuse right there in the interior fuse panel.
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
it says VEH STOP
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Customer reply replied 1 year ago
I was able to reposition. Ingot 11.58. But I'll check fuse too
Customer reply replied 1 year ago
Fuse is good
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
oh if you got 11.58 its good
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
ok now press brake pedal and check for voltage at white wire pin A
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
does it have 11.58?
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Customer reply replied 1 year ago
11.26
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
ok we now know that your brake switch and everything before is working
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
look in your door sticker is your truck over 8600 gross weight or under?
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Customer reply replied 1 year ago
Under. 6400lb
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
also rear drums or discs?
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Customer reply replied 1 year ago
Drums
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
having trouble getting right diagram they have 100 different options
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Customer reply replied 1 year ago
I understand
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
you have a brown wire going in to your switch?
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Customer reply replied 1 year ago
Yes
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
check for power
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Customer reply replied 1 year ago
It appears no
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
according to this diagram you have a bad 10 amp fuse in the instrument panel fuse block
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
put one end of your voltmeter to ground and with the other end touch the little metal pieces sticking out on top of the fuse if they have power on both sides they are good
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
if only on one they are bad
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
check them all especially 10 amp
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Customer reply replied 1 year ago
All of the 10 amp fuses have power. The only one that seems to have no power is a 15amp with the label of ddm
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
it has no power on both sides?
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Customer reply replied 1 year ago
I cannot get a reading on it
Customer reply replied 1 year ago
Disregard
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
ok
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
are your outside fuses marked?
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Customer reply replied 1 year ago
Sorry, I must not have got a good connection the first time. It's dark out to which is fun
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
do you have a 25a that says STOP LP?
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
I HEAR YA!
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Customer reply replied 1 year ago
The only 25 is the flash and windshield wiper
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
there has to be one maybe thats the problem someone put in a smaller fuse and it fried
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
you are talking about the outside box right?
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Customer reply replied 1 year ago
Inside the truck
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
i may be running too fast and confusing you
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
we figured all were good inside now i want you to check the outside that says STOP LP its 25a
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Customer reply replied 1 year ago
Ok. That one shows power to both sides
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
ok now go inside to brake switch and check black wire for voltage
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Customer reply replied 1 year ago
There is no black wire
Customer reply replied 1 year ago
Purple, orange, green with white stripe, green with brown stripe, brown, whitems
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
i cant get the right diagram
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
from what weve done so far the problem has to be in the back
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
a common thing that happens is the wires in the back especially when theres a trailer hitch get damaged
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
im sure you cant see any of those connectors now. Can you pull out a tailight?
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Customer reply replied 1 year ago
I can, but before I do so, of I slide the brake controller lever over and manually engage the trailer brakes i do have all break lights
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
can you see where it taps in?
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
forget about the rear lights now. lol
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Customer reply replied 1 year ago
It uses a harness that makes it plug and play. It connects in the black "box" to the
left of the brake pedal
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
disconnect it see what happens
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
disconnect and press brake.
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
now it makes sense why cant get right diagram it has a factory installed trailer hookup
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Customer reply replied 1 year ago
No change
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
ok plug it back in.
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
so with the brake pedal pressed you have voltage at the white wire on switch?
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Customer reply replied 1 year ago
Yes. About 10.8
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
that white wore goes to the vehicle stop fuse and it comes back out and through the underhood fuse panel and it turns L BU whatever that color is
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
then it turns down and goes to the tailight connector
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
very possible you may have a bad connection in the underhood fuse box ide pull it and examine
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Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
do you want me to opt out and let someone else maybe that can help you better or you want to stick with it with me?
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Customer reply replied 1 year ago
I'm to a point tonight where I can't devote any more tI me to it unfortunately
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
ok no problem
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Customer reply replied 1 year ago
Thank you
Chevy Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
good luck to you and thank you
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