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The fact you have melted wires is a big concern. If the wires were melted, that means the components connected to them as also melted, even though they should have been protected by the fuse. The multi-pin plugs that connect to the fuse box are probably melted as well.
Diodes are a one way valve for electricity, it it had diodes, it needs diodes.
Next to the alternator and battery you'll find an essential, though often overlooked component; the diode. Diodes allow current to flow in only one direction. ... Functioning as a gatekeeper for back feed into the circuit, the diode protects essential elements of the car from current spikes.Aug 25, 2020
Well, maybe. When you modified the original fuse you could have provided a way for the short to get much worse. LIke putting a penny in an old fuse box on a house. The penny has to get super hot to melt compared to the original fuse. Or it could make the connection that was overheating fail competely. Fuses melt when there is too much current in a circuit. Which can be a short to ground or a weak connection. A weak connection will carry current, but with much resistance which causes heat.
You'll have to take a meter or test light and start at the battery cables and work back to the fuse box, including the ground side. Also make sure the actual battery cables are clean and tight.
see if all wires are connected tightly...battery,starter alternator. also see if any wires look melted or burned. if all that is fine then maybe a voltage regulator (if it has one)
Ck your fuses next to the battery . this fuse box has a bad problem of melting and causing this problem . But i could just be blown bulbs i work on a lot of New Beetles and have seen the bulbs blow at the same time
Are you check in the Power Distribution Box? this is located in the engine compartment. The power distribution box contains high-current fuses that protect your vehicle's main electrical systems from overloads. Check the position 7, 20AMP (mini-fuse).
Get under the front bumper look strait up on the side of the battery there you will see two horns low/high. test voltage from battery at horn.
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