On Jul 30, 7:11*pm, Conor wrote:
In article cc3c2337-405c-4e1c-9c7e-35359c976734
@b1g2000hsg.googlegroups.com, *says...

That would explain your failure to see the spikes. Try repeatedly
switching off the rear window heater while measuring next time. Then
try it for real: switch off all accessories and waggle the loose
battery connection. Dont have your laptop connected

**** all happened. Difference is I had the night heater in the truck
instead of a heated window. A night heater is a bit of kit which has an
electrode which heats up diesel and a fan to blow the resulting hot air
into the cab. Works like central heating in the fact that you set a
temperature and it comes on and off to maintain that.

A night heater draws more current than a window heater and the
electrical noise from the fan far exceeds that of the window heater to
the point where it can be seen as RF interference on a TV.

And my laptop still works.

So again, you're talking out of your arse.

Can you read ok Conor? 'Dont disconnect the battery with the laptop
connected' is what was said. Tell you what, since theres no problem
why dont you try it and prove it to us.


NT