If you have a drain on your battery , it would not take 18 months for the battery to go dead . What do you mean The battery gauge in the dash shows only about 1/2 power, When ? When the vehicle is running ? Not charging ! The battery gauge as you call it has nothing to do with the Battery . That's showing how much the charging system is putting .The volt's indicator is controlled by the PCM - engine computer . With the engine running should show 14.1 volts .if your only seeing 7 the charging system isn't working. The alternator is controlled by the PCM as well ! Have it check by a GM dealer .
SOURCE: 1997 Pontiac Bonneville runs fine for hours, but then charge dies
It sounds like your alternator belt is loose. It will expand as it gets warm from running the engine. That will allow the battery to drain. Tighten or replace the belt.
SOURCE: What do I have to remove to access blend door actuator
very lenghty process. too long to describe here....go to Bonneville Forums read the text and follow linked there at the bottom....very good and detailed....I'm doing that right now,,,,it is a bugger,
SOURCE: 2003 Sundifre won't STAY running
The gauge problem sounds like the common issue on the 03-05 Sunfire instrument clusters where the stepper motors on the cluster's circuit board fail over time. It can be fixed, check out this page for more on how to get it repaired - Sunfire instrument cluster fix
SOURCE: How do i get to
u can check compnine.com for a diagram ur best thing to have is the original service manual u can find on ebay cheap or get from the dealer much better than a chilton or haynes
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