Question about 1993 Lincoln Mark VIII

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1995 alternator won't charge battery-took alternator off and it charges fine on tester-won't charge in car???

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Not to be contrary, but if it doesn't charge on the car, it should not charge off the car-no difference. With it installed on the car, the large post on the back, with the engine running, should be tested with a meter-It should read about 14.3+ volts while idling, and whatever it reads at the alternator post should be very identical at the battery-if not, your problem is the harness going back to the battery, and you can do a quick fix by running a 2 gauge wire from the pos post on the alternator to the pos post of the battery, then your battery will charge IF the alternator puts out enough voltage AND it does not have a weak or burned out diode. Remember, your Mark is almost 19 years old now and it has almost 3 times the amount of wire in it as a normal car-very complicated and wire, over time, deteriorates and resistance icreases. I hava a 96 Mark VIII and I had a 93, so I am familar with them-your 93 has a 120 amp alternator which is marginal for any Mark, even new-I installed a nw 200 amp unit, and a 1000 cold cranking amp (32 degrees) battery-you HAVE to have a strong system with good connections throughout.

Posted on Apr 04, 2011

Testimonial: "Thank you so much for taking time to answer my question. I am a single woman and don't know who to trust at the auto repair shops."

  • mike mountain Apr 05, 2011

    print out my answer and take it to someone you trust-a good amateur mechanic can easily diagnose your problem if he has a meter, the alternator on a 93 mark is probably one of the easiest ones to remove you'll ever see (less than 10 minutes, easy)-if you decide that the alternator is weak or deficient, I bought a good 200 amp alternator from DB Electric, they are located in Tennessee and if you google the name, it'll come up-mine cost about $215 delivered, and I have had it in mine for over 3 years now, no issues. I love my Mark but electrical monsters they are and they devour weak batteries and alternators. Contact me at MikeMountain@comcast.net, I can talk anyone through this issue, and a 93 is worth saving (they are the quickest because they have the best factory tune).

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