voltage gauge reading

[Kent McLean]

A big Thank You to William Ng, who wrote:
> You should also read the digital voltage meter built into the Climate
> Control head instead of the dash gauge. It's more accurate and responsive.
> The dash gauge is usually off by 0.5-0.7V on the low side. Also it doesn't
> react to voltage changes well. Surprising for a VDO gauge.
>
> Press "OFF" and "Outside Temp" simultaneously.
> LED digits read "00" to indicate diagnostic mode ready.

Mine read '01.

> Press "HOT" to increment to "11".

"Warmer" to increment to 11.

> Press "Outside Temp" to enter voltmeter mode.
> TADA!

That is so cool.  Mine read 11.9, dropped to 11.8 when
I revved it, then bumped up to 12.2 and 12.3 before
soaring to 13.x (no radio, no fan, no lights).

I think the alternator is OK. I suspect it's due to a non-metric
belt that wasn't properly tightened, or it stretched and
loosened. I'm visiting Bruce at AudiConnection on Saturday.
He's got a new belt for me.  We'll see if that fixes it.

Here's one for Mark's Wiki Knowledge Base.

So, what other diagnostic modes does the CC have?
Is this stuff in the Bentley manual?

Kent
'89 200 TQ, "Bad Puppy"