2004 Can a malfunctioning Garmin GPS screw with the cars performance?

O
Last seen
Joined
Nov 21, 2017
Thunderbird Year
2004
I plugged in my GPS and now my blinker quit and my battery drains.
 
It may. I think you should have your battery tested to be sure it is in good condition.
 
A weak/failing battery can cause all kinds of problems.
 
I don’t see how a plug-in Garmin can affect anything. They only draw milliamperes of current and use passive antennas.
 
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