I have the same problem in 2/3 of the cars I've tried it in. The springy center part does not spring out correctly leaving only intermittent contact. I got Garmin to sent me a second one free, but it has the same problem! This makes 3 total, since I had one of the older style ones with the COM port for my older unit. I had to fix that one using the spring from a ball point pen.
It's not just in my car either. I've used other car adapters without any problem.
Recently purchased a Garmin Talking Street Pilot III Colormap. The lighter adapter included with it has an integral speaker which I find to be quite satisfactory and very helpful when driving. You will no longer have to watch the GPS screen, as Ms. G gives you voice prompts (as long as you use the auto routing feature) when you need to make a turn, etc. If you need an adapter, get the model with the speaker!
MISLED by James Steiner !!! please be responsible for review
be warned!!! don't believe James Steiner's review about this adapter working on eTrex!!!
nothing wrong with the item itself but, this product is NOT for eTrex series at all!!!! i kinda knew that by looking at its description, but the following review just misled me to the wrong way so now i have a headache to deal with when i got the Vista and the adapter that doesn't work on my GPS.
Reviewer: James Steiner (see more about me) from Oceanside, California USA I use this with my Garmin E-Trex Vista. Never worry about running out of batteries as I drive. Use away from home to track your travels. Cord is long and durable. Light lets you know if it is getting power.