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I have a 2004 Chevy Colorado.I have no brake lights I

Customer Question
replaced the switch and checked...
I have a 2004 Chevy Colorado.I have no brake lights I replaced the switch and checked the fuse what else can cause this problem?
Submitted: 2 years ago.Category: Chevy
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Answered in 4 minutes by:
1/27/2016
Chevy Mechanic: Randall C, ASE Master Tech replied 2 years ago
Randall C
Randall C, ASE Master Tech
Category: Chevy
Satisfied Customers: 13,276
Experience: ASE Master, L1, 32 years, Diagnostic / Electrical Specialist
Verified

Hello, do you have a testlight or volt meter? we need to do some tests

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Customer reply replied 2 years ago
I have a volt meter
Chevy Mechanic: Randall C, ASE Master Tech replied 2 years ago

WE have to start with basics, Get to the brake light switch, probe the orange wire with key off, I need the volts, then hold brake pedal down and probe the LT blue? wire and need the voltage readings, I think i am correct on wire colors, you leave switch plugged in, I need you to backprobe the 2 wires at the connector at switch

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Customer reply replied 2 years ago
11.8 vdc at orange and 8.5 at blue with pedal depressed.
Chevy Mechanic: Randall C, ASE Master Tech replied 2 years ago

odd, both should be battery voltage, nothing less, I am unsure why the low volts , is battery fully charged? can you remove the stop fuse and probe the fuse terminals and see if battery voltage there

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Customer reply replied 2 years ago
Not sure but it doesn't appear to be getting any power to the fuse
Chevy Mechanic: Randall C, ASE Master Tech replied 2 years ago

that would not be possible if you have 11.8 at orange wire at switch, You removed the stop fuse, probed the fuse terminals no power to either?

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Customer reply replied 2 years ago
Nothing constant
Customer reply replied 2 years ago
I don't seem to be getting a good connection at the terminal itself
Chevy Mechanic: Randall C, ASE Master Tech replied 2 years ago

im going to opt out, i am unsure which direction to go with non tests

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Chevy Mechanic: Dan, Technician replied 2 years ago
Dan
Dan, Technician
Category: Chevy
Satisfied Customers: 25,782
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
Verified

Disconnect brake light switch and jump orange wire to blue wire and let me know if that turns on brake lights. Thanks.

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Customer reply replied 2 years ago
No it didn't help still nothing but taillight
Chevy Mechanic: Dan, Technician replied 2 years ago

Are you 100% sure you have voltage on orange wire?

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Customer reply replied 2 years ago
What about the loose connection at the fuse box
Chevy Mechanic: Dan, Technician replied 2 years ago

If connection was loose voltage would be low on orange wire. Are you sure you have good voltage on orange wire?

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Customer reply replied 2 years ago
Getting nothing at the orange wire now
Customer reply replied 2 years ago
Not getting a good connection at the brake fuse since probing it
Chevy Mechanic: Dan, Technician replied 2 years ago

This wire gets voltage from the 20 amp STOP fuse in location 1 of fusebox under the hood. Check to see if fuse is good if so remove/reinsert fuse a couple times incase it has a poor connection. If that doesnt help check connections at fusebox. If still no good then replace orange wire that goes from fuse box to switch. Let me know how it goes or if you have more questions. Thanks.

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Here is a wiring diagram to help with testing.

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https://www.dropbox.com/s/rc7gawi9rf5u0hz/blsww.pdf?dl=0

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Dan
Dan, Technician
Category: Chevy
Satisfied Customers: 25,782
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Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database

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