No car power adapters work!

I have have tried 3 power adapters sold at the Apple store and none work with the PowerBook G4. The saleperson was very helpful, but said that they have seen this before! (Green light comes and then it slowly blinks yellow or just stays green.)
I asked what the solution was and they suggested that I used the Apple 110v adapter with an inverter. That is what I tried first and it didn't work. They said buy a more powerful inverter like they sell at Lowes. So I bought one and with the adapter pluged in all is fine. Plug the adapter into the Mac and the plug is green for a few seconds and turns yellow. When it turns yellow the inverter goes into overload, screams, and cuts off!
I called the store back and they suggested I order the latest kinsington adapter for cars from the Apple store online. Now it doesn't work either and kinsington says they have not found a way to charge this model in a car! Is that true?
PowerBook G4 (15-inch Aluminum)   Mac OS X (10.3.9)  

Actually I've had an iGo Juice for over a year now, and it works just fine in the car, in an airplane, and in a wall socket. (I use it on a 15" alumunimun PowerBook G4, machine model 5,2.) Radio Shack sells them, though I bought mine at Macconnection.
Hope that is helpful.

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