Ammeter Resistance and Voltage drop

Car door probably was open, drawing current. I’m pretty sure I have both an ammeter problem and a key switch problem. I can measure across the ammeter and it measures 4 ohms, which seems pretty high. I disconnected the battery, and traced the resistance though the fusable link, bulkhead connection. 4 ohms across the ammeter means I would get 2v drip with only 500mA. I’m surprised the ammeter works at all but I can see it move just a bit which is kinda throwing me off. In any case, I have another ammeter and switch on the way. I’m pretty sure that will fix the problem. And yes, I plan on measuring the resistance of the ammeter when I get it.