I put these drawings together to see if they will help. This pertains to bypassing the blowing fuse. Figure 1 shows a typical Power Distribution Center, (under-hood fuse box). One fuse has been pulled out. It is shown expanded in figure 2. Figure 3 shows the items you'll need. At the top are the small jumper wires. You can find these at Harbor Freight Tools or just about any hardware store. They typically come in a package of about a dozen for around three bucks. The terminals on the right are generic crimp-type replacement terminals. These can be found at the hardware stores and auto parts stores, but you have to buy a box of as many as 50. Instead, ask any mechanic. They often have a bunch running around loose in their tool boxes. If necessary, you can tug off the insulator at the end so the clip can be attached. That would be the blue terminal on the top right.
At the bottom left I showed my favorite bulb, a common 3157 brake light bulb. It's easy to connect the jumper wires to, but be aware it is going to limit current to one amp. Once the short is removed, the engine likely will not run because one amp isn't enough to run everything on that circuit. It will run one the fuse is installed.
Connecting these parts takes all of a half minute. Plug the two spade terminals into the empty fuse socket as shown in the fourth drawing. Connect a clip lead, (jumper wire), to each one as shown, then the other ends to the light bulb.
If the short is constant, as soon as you connect the second jumper wire, the bulb will turn on full brightness and will get hot. Now you can move wire harness around and unplug things to see what makes the short go away. When the short is not in the circuit, the bulb will get dim or go out.
If the bulb is dim when you connect the last clip lead, the short is not there at that time. The same procedure applies. Move the wire harnesses around until the bulb flickers or flashes bright. When it does, whatever you're doing is related to the location of the short. No need to turn on the ignition switch, and no more wasted fuses.
Images (Click to enlarge)
Wednesday, May 5th, 2021 AT 9:53 AM