There are also ways to tell where you are losing current....you need to get a long heavy gauge jumper wire and put alligator clips on both ends....First measure the voltage at the + and - ends of the fuse box. Should be close to or at battery voltage. Turn the ignition key to ON and see if it drops then. If its lower then try running a heavy gauge jumper wire (like 8 gauge) from the battery + to the fuse box as a test. BE CAREFUL not to ground this anywhere! If your gauges now work better and the fuse box voltage is the same as the battery, there is a fault in the positive feed to the fuse box. If this test yields no change, then do the same with the negative feed from the fuse box, connect the jumper from the neg terminal on the fuse box to the battery -. If you get an improvement then, the fault is in the return path. Sometimes one bad connection in the engine harness can cause this esp on the positive side. My boat had low voltage with the ignition on, I was not able to trace it in the engine harness, so I semi permanently added a supplemental feed form the battery common (fused) to the fuse box. Now my gauges and other dash accessories all get 12+ volts and everything works reliably. Not a perfect solution but when I get time I may troubleshoot that engine harness further, just did not want to rip it apart if everything works this way....
_________________ 88 Four Winns 200 Horizon 4.3 OMC Cobra-4bbl 2002 Walker Bay 10/2012 Suzuki 2.5 2008 Walker Bay 8
1998 Jeep Grand Cherokee 4.0/Selectrac 2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II
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