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Curtis, Australia Car Mechanic
Category: Australia Car
Satisfied Customers: 1609
Experience:  Qualified Automotive Mechanic, LPG & Airconditioning Diagnostic Technician.
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Its a Sierra 3500, I try to start it, checked both batteries

Customer Question

Hey Pearl its a Sierra 3500, I try to start it, checked both batteries whould be enough voltage to start them, it won't turn over like it is a flat battery and then the horn blasts 3 times
JA: Does the battery look like it's leaking? And does it have a strong smell -- like sulfur?
Customer: both new batteries
JA: What year is your Sierra?
Customer: 2000
JA: Are you fixing your Sierra yourself? What have you tried so far?
Customer: no I have auto electricians and a mechanic they have checked all the wriring as some of that was out replaced the secondary battery
JA: Anything else you want the mechanic to know before I connect you?
Customer: checked fuses
Submitted: 9 months ago.
Category: Australia Car
Expert:  Amedee replied 9 months ago.

Hello and welcome!

My name is ***** ***** I can assist you with your question.

Expert:  Amedee replied 9 months ago.

I will try my best to answer all of your questions.

However, before we get started, please let me mention a few things.

1. If at any point you would like to speak on the phone, please feel free to request a phone call on your end and I can call you right away.

2. If you dont understand any technical terms or anything that I mention (component tests or theory or operation), please let me know and I will provide you with a more in debt explanation or answer.

3. Please understand that I am here to help you anyway I can.

Can I start by getting your VIN?\

Thank you!

Customer: replied 9 months ago.
Customer: replied 9 months ago.
Expert:  Amedee replied 9 months ago.

Thank you for that information.

So the engine does not crank over correct?

What is the battery voltage at on both batteries?

Customer: replied 9 months ago.
Engine does crank over, just won't start and then it sounds like the batteries are being drained. The main batter is now at 7 (should be 12) and the secondary is still around 12. The 'wait to start' light flickers on and off, which is new, it use to be on solidly then go off, so I wait for it to go off, start, and it grinds, wont turn over, like a flat battery, then the horn blasts
Expert:  Amedee replied 9 months ago.

You could simply just have a bad battery or batteries..

Have you tried jumping them or charging them?

If so, and if the voltage still stays low on the main battery it is bad and will need to be replaced.

Customer: replied 9 months ago.
we have done all that, I've had mechanics out, I've had auto electricans out, when he left yesterday it started, today it does not. One battery if brand new, the other about 6 months old. Why does the horn sound ? that is new, what causes that
Expert:  Amedee replied 9 months ago.

When does the horn sound?

Customer: replied 9 months ago.
when it won't start, it ends with a horn blast
Expert:  Amedee replied 9 months ago.

Security system, wiring, fuse block or BCM could do this..

Customer: replied 9 months ago.
ok well your of no help whatsoever ... thanks
Expert:  Amedee replied 9 months ago.

Can we continue?