You have received several responses that I think are on the right track,
i.e. the 12V receptacle on the vehicle can not supply the needed current.
But there are a couple of other things to look at as possibles.

Has this setup ever worked for you or is this something new? If it has
worked in the past but is not currently then the receptacle probably can
handle the load, unless something in the wiring has degraded.

Why two inverters? What I am concerned with here are ground loops and odd
returns between the two power sources. Particularly this could be an issue
if this loop is manifesting itself as current on the return line of your
RS-232 link between the Laptop and the scope. As the two units are DC this
should not be an issue, but maybe. My personal setup is one 300 Watt
inverter to run both the scope and the laptop. The laptop draws much less
than 100 Watts and the same with the 10" LX200, leaving the inverter
normally running at about 100 Watts max, with occasional short duration
peaks up near 150 Watts.

Darrell

>I have a 3-plug box that splits the 12v receptacle from my vehicle into
>three.
>In 2 of the plugs I run 2 inverters, and the third plug runs the Kendrick
>heater
>control. The LX200 is plugged into one inverter and my laptop into the
>other
>inverter. I power on the LX200 first. When I turn on the laptop, the
>LX200
>ammeter flickers intermittently and then the scope shuts down, obviously
>because
>of insufficient current. I don't even get to power on the Kendrick
>controller.
>What am I doing wrong?
>
>


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