VW Beetle '74

tighten head bolts down to 40 nm (29.5 foot lbs) then 90 degrees than another 90 degrees starting in center make sure head bolts holes are clean and oil head bolts thats it

If you put battery voltage to the starter solenoid &
it works & the starter works,then the solenoid control
circuit has issues

Fuse,ignition switch,neutral safety switch,clutch sw
& such, depending on what the car has

You could try switching relays but doubt that is an issue

you have to remove the serpantine belt and then the alternator has 2 bolts one top one bottom remove both it slides out put new in put new serpintine belt on good to go 2 hour job

We have a 2000 Beetle. You have to remove 4 allan head bolts and remove the throttle body . Remove it from the large hose. This allows you to get to the alternator . Undo 3 bolts on the belt tensioner and remove that. Undo the electrical connections on the alternator. Undo 2 bolts holding the alternator on to the bracket and pry out. Here's where I just about had a meltdown, the alternator won't fit out past the body work. However remove the passenger side headlight. There is a plastic lever you slide all the way up and slide the headlight out. Remove the 3 torx head screws to remove the headlight cup and the alternator will come out no problem through the headlight hole.

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Consider removing the intake and exhaust manifolds on vehicles with a 010 automatic transaxle. This may provide better access to the starter motor. Place all nuts and bolts in a safe place to prevent loss, such as a baby food jar, because you will need them later.
Disconnect the electrical connections from the starter. If it might be difficult to remember where the wires attach, use masking tape and a permanent marker to label them before disconnecting.
Remove the bracket that secures the starter to the engine on 010 transaxle models.
Use a floor jack to support the weight of the engine, because the starter bolts also secure the front engine mount to the transaxle. Also support the weight of the starter. Remove the starter mounting bolts and pull the starter motor straight out from the transaxle to remove from the engine.
Take your malfunctioning starter to the parts store with you. Aftermarket distributors remanufacture most of the starters they sell, so you can likely obtain a partial credit toward your new starter by exchanging your old one. Be sure that you take care not to damage the starter in transit, because the better condition it is in, the more you can get for it
Purchase a replacement starter that has the same or higher cranking capacity (power rating) as the original starter. Also, match the bolt patterns, drive gears and electrical connections. Your owner's manual may list specifications or the auto parts technician will help you determine them. Purchase an owner's manual at Volkswagen of America (see Resources).
Reverse the removal process to install the new starter. Torque the mounting bolts to between 33 and 44 foot pounds (45 to 60 Nm), depending on the engine size. On engines with a 010 transaxle, tighten the mounting flange bolt to 15 foot pounds and the bracket bolt to 15 foot pounds
Lower your Beetle back to the ground. Reconnect the negative battery cable. Turn the key in the ignition to see if your new starter motor functions correctly.

The starter motor is held in position by 2 bolts, the top one also secures the engine to the gearbox. The head of this bolt is a special D shape which engages into the body of the Starter motor. To undo, from the rear o/side wing, reach down behind the fan housing and you'l; find a nut (17mm) with a small amount of the bolt coming through it. Use suitable spanner to undo (turning away from you) If not been off foe a while may find that after a few revolutions all starts to turn. This just means head of bolt has become disengaged. reposition with a long screwdriver and start again.

Imagine that the head bolts are numbered from left to right.  Go 2-3-1-4 and set the wrench to 23 ft/pounds.

they have a clip thats holding the wires in,undo the clip lift the wires out and slide it off the starter

Check with VW performance parts suppliers, there are better choices, the stock carb is made for MPG not horsepower.

check your mass air flow sensor , it take over fuel pump control after the engine starts