Question about Mercury Sable
Before you change a few more generators. Control graund contact between the engine and car body.
Posted on Mar 20, 2011
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Posted on Jan 02, 2017
If you ask for a one wire delco alternator,all you have to do is connect the large wire on back of the alternator to the positive battery post on the battery.The alternator is self energizing,there for no problem with wiring up a harness.If I can help,let me know my name is Ron.>>>firstname.lastname@example.org
Posted on Aug 16, 2009
SOURCE: alternator wont charge batteries
I can't give you more than generalities without knowing your vehicle model.
The alternator has several connections: Battery charge, Battery sense, and Field. The charge wire carries charging current to the battery. Since there is a voltage drop across this wire, a separate sense wire feeds the actual battery voltage back to the regulator module inside the alternator. The regulator then controls the current going to the Field terminal (a winding inside the alternator), which in turn controls the charging current. There may also be a separate Ground wire, but usually the alternator frame is supposed to be grounded through its mounting bracket.
The first thing to do is check each of the terminals for corrosion or loose connections. In particular, if the alternator has recently been serviced, or if somebody was working near it, check ring terminals on threaded studs to see if they have been left loose. Make sure the connections are clean and free of corrosion or arc burn oxidation, especially at the battery. Make sure screw connections are snug, but do not over-tighten - you don't want to break the connector stud.
If the connections and wiring look good at both ends, check the voltages on the terminals. The charge terminal voltage will be slightly higher than the sense voltage. The difference will be proportional to the electrical demand on the system. The field voltage will show a larger change with load (e. g., it should increase significantly if you turn on the headlights). Voltages must be measured with the engine running, so be very careful not to get the test leads or yourself caught in the alternator belt.
Posted on Nov 14, 2011
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