buylow12 wrote:
I believe it checks both. By positive to positive you mean it's 12v right? I think goes to mc4 those just connect the panels together correct? The problem is most of the wiring on the roof is under the panels, it looks like they may be able to slide or disconnect from the mounts somehow though I could be wrong, I'm just not sure how to do it. If I can't do that I'll have to cut away the sealant to get to the wiring I think. I should have watched my friend install it 3 years ago....
You don't want to remove anything up there until you are sure the problem is up there. If you remove the positive and negative wires from the contractor that go up to the panels you should have power on those wires if the sun is on the panel. A 12 volt panel may put out around 20 volts or so. If you follow the instructions for your multi meter it may be able to check the amperage on the panel wires. It's called a short circuit amperage test.
Of the screw that holds the panel to the bracket is up under the edge of the panel And the other end of the bracket has screws and dicor it's called a Z bracket and was invented by Murphy. They are cheap and easy but that's all.
lso be sure that you have battery voltage coming from the battery to the solar controller. You should see battery voltage there. Only check for voltage not amperage at the battery wires.