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I checked the connection to the RJ11 box with a voltmeter and with the car off voltage was 12.65, nice and strong. While cranking, dropped down to about 10.6V one time and 11V the second time. Then the voltage shoots up to around 14.5V with the car on. So it seems like I've got a good strong connection. But I'm still going to clean the terminals again anyway.
Voltage of course fluctuates slightly with the car on and even with the car off when I turn on/off different devices that draw current.
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