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in the alternator
Almost ALL of today's alternators have a built in, solid state regulator.
Most voltage regulators are now inside the alternator. You might want to verify that at an auto parts retailer.
To change the voltage regulator on a 94 Geo Tracker, locate it in the black plastic box on the back of the alternator. Unplug each cable from the regulator, remove it and replace.
No they will not fit. after 1994 the Geo Metro developed a new more curved body system. You can use a 1989 - 1994 Geo Metro door though.
You can get a window regulator for a 1993 Geo Tracker at auto part stores. You can also check with local salvage yards.
Inside the alternator
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No, it will not. After 1994 the Geo Metro became more curved so any part from before 1995 will not fit your geo metro. You can use any hood from 1995 - 1999 depending on the body style.
There is not one.
The timing marks on a 1993 Geo Metro are located on the on the camshaft and crankshaft sprockets. They must be aligned together to ensure proper initial timing.
It is built into the alternator.