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I can tell you that on a 2000 mercury cougar it is a fuse on the positive cable between the battery and the alternator
One possible cause is a defective alternator, Have the charging system checked.
One of the easiest ways is to check for charging voltage at the battery. Connect a volt meter to the battery and note the reading. Now, fire up the engine and watch the meter to see if the voltage increases. The 90 Merc 16 amp stator should level out at around 14-14.5 volts.
charging system not charging battery with new batttery, alternator and fuel pump. what will make that happen ?
The battery light indicates the system is not charging. Have the charging system checked. If the alternator is not charging, the engine will quit running and leave you stranded.
A Mercury outboard water pump is a engine cooling system. A outboard water pump is what blows steam through to get the car cool,
Have the charging system checked. The light comes on when there is a charging system problem. it may be a battery, alternator or a battery problem.
usually that the battery isn't taking a charge. have the alternator checked, many shops will test the charging system for free
The charging system may be over charging the battery. Over charging the battery can speed up the evaporation process. Have the electrical system tested.
Under the battery tray. The battery and battery tray must be removed to gain access to charging system fuse.
Defective alternator, short in battery, or loose or corroded connections.
1. Alternator charging system malfunction.. [not charging enough]