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It might look like it will with the belt off.. Once the belt is on, the spring will put tension on the belt and will ride on the pulley. To answer your question..yes there is a spring in the pulley bracket
nothing wrong with the ECM unless it has the voltage regulator as part of the system
indicates faulty wiring and faulty alternator
have a load test done on the battery
have an auto electrician do a full charging system check
charging voltage should be 14.5-14.8 volts DC
battery voltage should be 12-13.5 volts dropping to 11 volts when cranking the engine
make sure that the drive belt tension is correct and the belt is in good condition
No need to replace the hub just the studs. The come in from the back and are splined to prevent the stud from turning with the nut. Remove the hub --drive out the broken studs and put the new ones in from the rear and drive them back in. Get the studs from the dealer spares or a good tyre retailer.
You need to have the alternator checked. The tachometer runs off signal from the distributor, but can be indirectly affected by the charging system. It may be as simple as tightening the alternator belt, but I would guess that the alternator itself is going bad. Alternators that are marginal in charging ability anyway (old) may just go bad under the load of charging a fully dead battery.
Belt goes over power steering pump,under idler on left,over AC compressor,over alternator,over fan (with back of belt ) over crank pulley then over water pump (back of belt) then back to p/s pump. Routing is counterclockwise.
when you take alternator out of play. the vehicle runs. i would be replacing the alt. these units are complex containing modules, regulators that can give you erratic problems, but i think u answered your own question alternator