A puzzle for the Sherlock Holmes of Commodores!

[Sizzle87]

+1 alternator. Check battery voltages, check voltage on car while running. Intermittent fault on alternator, could be supporting bracket that is near the +B terminal touches, or arcs. Reason being is a mechanic might've taken it off and put it on backwards (like I did the other night) and then it won't have the necessary clearance to avoid the arc.

Check rubber and guard around +B terminal (bolted cable behind alternator) for evidence of arcing. If it's melted slightly or seems to have a hole, there might be your first indication.

 

[Mk2]

I had very similar issues a while back. I was quoted ABS module as well but an auto elec friend of my brothers suggested I just swap out the alternator and see what happens. Fixed it.

 

[Nikko86]

Thanks for all the replies. So, they sent the module away (they had no replacements on the shelf) and apparently a problem WAS found with the ABS module. But without the module in, the same problem still occurs. When I told them that, the response was "That's weird. We'll have a look."

So, I guess I'll just ask them to poke around the alternator.

 

[Mick1988]

I would suggest a battery first as its easy to borrow from a friend and always worth eliminating.

Then I would be checking each and every earth point in the engine bay.

Then Id change the alternator.

ABS unit is not normally an intermittent issue.

 

[s_ikari2015]

well if the module is faulty, then when it's connected it's gonna send problems through the system... when you disconnect the module the system goes "hmmm not getting a response from the module... somethings wrong". So why should the problems stop when you disconnect the module? They should stop when a fully operational module is connected, right?

 

[brad_m_is]

alternator regulator

 

[lout]

please just replace the alternator so this thread can end

 

[Nikko86]

Lout, replacing the alternator would have done nothing. It was the cluster dying.

Thanks everyone for the help!

EDIT: Apparently, it's on the same line as the ABS Module, so when it's playing up it can have the same effects.

 

[lout]

I sure hope your correct but I think you will still find it's the alternator
keep us posted in a week or or so

 

[VTS5]

(interesting) what was wrong with it? cause im sure alternator is the culprit.