jus1975

I have a 2004 GMC sierra. Has anyone installed a Mechman Alternator. Im having messages on the dash for no battery charging. But its charging. The message is not all the time. comes and goes. Ive changed the 12 volt feed location. didnt fix it. Also Im getting a service brake booster message. Mechman is very helpful but cant fix the problem. They said its just a ghost code. nothing can be done. But I cant leave it alone and I can never get it inspected. Anyone figured it out Thanks