[TR] Electrical diagnosis: Update

[Dave1massey at cs.com]

In a message dated 6/14/2010 9:15:13 AM Central Daylight Time, 
KingsCreekTrees at aol.com writes: 
> Both batteries show 12V, which suggests to me that the TR's battery is 
> not faulty. This leads me to start thinking that wherever the bad connection 
> is, corrected itself a couple of times, coincidentally when I fitted the 
> Volvo battery.
>  
> 
Bad assumption.  The battery is actually a collection of six cells.  It 
sounds like one cell or the interconnection has gone bad.  This is not all that 
uncommon.  A friend of mine in the car business once told me that more 
batteries fail in hot weather than in cold - and they fail more suddenly.

So let me recap: with the Volvo battery the car cranks fine but with the 
Triumph battery it doesn't?  Sounds like a bad battery to me.  Take it 
somewhere and have ti tested under load and I'll bet it fails.

An open circuit test doesn't tell all the story.

Cheers

Dave