Originally Posted by Alumi-Naught
I am still on the hunt for this pesky problem. When I check for voltage at the battery I get 12.6/13.8 depending if I am on battery or shore/generator power. When I test at the individual circuit fuses, using the battery negative fuse as the neg reference I get a neg voltage at the individual ckt fuse. I would think the output should be a positive 12vdc. This would explain my lack of house power. Has anyone experienced this, any thoughts on the cause
Hi alumi-naught; How can you have a negative voltage in DC current? You may have a reversed polarity but not negative voltage. Voltage is a positive pressure, not negative. If your Voltmeter reads Voltage, then the polarity is correct. Available amperage in those wires can be sufficient just enough for the Voltmeter to read Voltage. This however does not mean that you have sufficient available amperage to run your circuits.
In some cases there is a 50 amp fuse in the system on the negative side to double protect your 12 Volt
system from shorts coming from shorted or reversed polarity on your 110 UniVolt circuit,through common ground. If this fuse is blown you can only pick up the negative connection through a turned on circuit such as light bulb which is insufficient to provide enough amperage to your panel. Load test the 12 Volt
input to your panel, you may have a loose or weak connection there. You can test for integrity of the circuit with a Amp meter hooked in line of a positive lead while connected to battery and applying a known amperage draw load to the end of that circuit. Plug in something of known amperage draw such as 12 Volt
coffee pot. If you observe same reading on amp meter as the specified draw at the end of the circuit the wire is good for the amount of that amperage.
Please bear in mind that a bad negative connection produces same results as bad positive connection which amounts to a incomplete circuit. Voltage is the level of pressure, Amperage is Volume. Volume [amperage] is needed to make things work. Thanks and good luck. Need further help PM me. " Boatdoc"