Reply to "Air Fuel mixture measuring device"

Sacto Mitch2013 VS Supporting Member

I think the main reason for traditionally putting the fuse on the hot lead is that the closer to the battery the fuse is, the more of the circuit the fuse protects.

Most anywhere in a car, and especially under the dash, there are lots of other paths to ground than the dedicated ground wire of this device.

So, if the body of the gauge is metal and rests against some other grounded metal, AND if something hot in the gauge shorts to the body of the gauge, the fuse in the ground wire won't help and sumpfins gonna burn up.

Likewise, if the insulation on the hot lead itself, between the battery and the gauge, is damaged and the lead brushes against a grounded bit, sumpfins gonna burn up.

My guess is they assume you're hooking the hot lead to a 12V source from the fusebox (that's already fused to protect the wiring ) and the fuse in the ground lead is a much smaller-valued fuse that's there to protect the circuitry in the gauge.

8/15/203:01 PM

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