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I have attached the brake wiring diagram. The TIPM which is the fuse box under the hood supplies 12v to the brake lights and if it only has 8v then you likely have a bad TIPM.. Do you know what codes are in the TIPM, this will require a scantool..
You have a code reader and you will need a scantool such as the WiTech I use here at the dealership to retrieve the codes from the TIPM..
Did you get the wiring diagram I sent? If you wanted to you can remove the TIPM and disconnect C7 and see if pin 47 has 12v or 8v. If it doesn't have 12v then you likely need a new TIPM but the proper way to diagnose this issue is with a scantool..
If that is the case then you should have 12v at the light connector and I wouldn't have had you test the TIPM. You have to understand I'm not there testing and I depend on you the customer to give me good readings.. Yes if you had tested 12v at the connector which you have since the bulbs are working then I would have had you replace the bulbs..
Glad I could help and thank you for the positive rating,
Your your referring to the test I asked for you to do as in testing for 12v to the bulb as misleading I have to say I disagree.. If the bulb will not light up the very first test is to check for 12v and ground. You said you have 8v and rises to 9v then you have a voltage supply issue, but if you replaced the bulbs and it worked then you do have 12v at the bulb and not the 8v you had first said. You may have had a poor connection which showed 8v, but either way it fixed and I appreciate the positive rating so I;m compensated for my time..
Have a great weekend,