Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
I know Holden very well, so I'll try to help you.
Your astra could have a bad crimp the battery positive and/or negative leads at the battery end.
Or the alternator isn't charging well.
If you can get the battery tested (voltage and load test), and then possibly jump start the car and check the charging volts at the battery.
A dead give away of a bad crimp is how hot the terminals get, right where the cable inner goes into the crimped terminal.
The average auto electrician should be able to fix it for around $100 or less.
Easy if you have the tools to do it.
Do you have an auto electrician nearby?
It could be any of many things with Astra.
Your description points to an overheating joint in a cable, but it could also be a battery failure, alternator, ECM, CAN-BUS wiring fault etc. An inspection of the battery and cables, then a Tech 2 DTC check of the vehicle would be wise to do now.
Are you near a Holden dealer?
If your gauges gave you an early sign of low voltage etc, I doubt if a blown fuse is your issue.
First thing I would do at home is measure the battery voltage at the battery, and then again between the alternator b+ and the engine ground with the ignitIon on. If they are the same, the crimps and cables are probably ok. If they are different by more than. 5 volt, there's a problem.
Have you had anybody look at it for you yet?
I have yet to see an Astra with a problem I could not fix.
I'm sure any Holden tech should be able to find your problem.