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Find each end of the earthing straps that connect the battery to the chassis, and the chassis to the engine and transmission. Take these connections off and test the cables for continuity, bend them and move them like they would be when the engine and trans move when acelerating and engine braking, as well as going over bumps etc then sandpaper the earthing points on the chassis, engine etc and both ends of the cables until they are bright metal.
Dab on some dielectric grease or I use copper slip to reduce future corrosion and tighten up all the connections good and tight.
Electrickery requires a return path to the battery that is just as good as the large positive cables supplying to the various components. If there is a break in the earth cables or corrosion etc the movement of the vehicle while driving could randomly act like an on off switch...........
Fusible link usually powers a section of vehicle, or a portion of fuseblock. Check your connections at starter. There should be the large batt. cable, and a couple smaller wires bolted together. Also check tightness & condition at battery end. If there were any fusible links (section of wire that melts when overloaded) they would be down at starter...
could be poor connection from battery to battery cable terminal. take off both pos. & neg. battery terminals, clean & reinstall, making sure there is a tight connection. if the cables are loose (even just one) or if the battery cable seems degraded with corrosion, they should be replaced. could also do a load-test on the battery... it should stay strong under load, and shouldn't drop to below 11 volts under load. if it does you have a bad battery, even though it may seem good otherwise.
Is this the steering wheel air bag? Pretty sure the center just clips in and the air bag just comes out. PLEASE PLEASE disconnect the battery before you start. Check behind the steering wheel some have small bolts holding the cover on.