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Old 01-06-2013, 02:40 PM   #2
Joseph Baker
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Join Date: Dec 2012
Fan#: 106879
Location: waterford, MI
What I Drive: 2001 E4 focus zx3

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well idk what the HU is but to check a circuit you need to put your meter leads in the right spots, black in the common/ground and your red in the votls ohms. then you set your meter to volts dc (direct current). now what you have to do is check the circuit in chunccks checking to see if there is power. so you put your red in on the first part of the circuit after the fuse and put the black on a kgg ((known good ground) any clean open steal connected to the frame or chassis or the frame/chassis. an open bolt screwed to the body or the best if possible reach the battery negative). now you check all the chuncks and when you dont have power is where your problem is and by doing that you find the problem by process of elimination but remember this most electronics on a vehicle have a 5 volts reference and the rest of the vehicle is 12-13 volts except the alternator which is much higher
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