Question about Metra 1986 93 Ford/Mercury/Mazda Vehicle Wiring Harness

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New alternator not charging battery

Wiring diagrams or information on charging system on my 86 ford ranger pick up, 2 wd. 2.9 v6.

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  • syph Apr 17, 2009

    im having the same problem any answers out there. i have a 99 f-250 super duty 2 wheel drive with the 5.4 in it.tried everything i can think of besides tracing wires.too dark for that now


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Hi Marco:
You will have to prove out the wiring to make sure there are no shorts, opens, or poor connections. If there are no wiring problems, then the EEC may be at fault. The crank sensor produces an AC voltage signal that may be getting corrupted by the time it reaches the ignition module, due to bad wiring. Make sure to verify whether the ignition module is receiving a clean strong signal by using an oscilloscope or at least measure the signal with an AC voltmeter at the ICM connector while cranking the engine. The voltage will vary with speed, you are looking for a steady signal that doesn't drop out or become erratic. You can run new wires, and make sure they are not connected to possibly shorted sections of the old wiring, by cutting the old wires off at the connectors and connecting new wires to the cut ends. Or replace the connectors and wiring if you suspect that the connections are bad. Inspect carefully for damaged terminals that won't make a good tight connection with their mating pins when connected.

Here is a basic diagram of the entire system, it is common to all the distributorless units even though this one shows a 6-pack coil.


Zoom Image link HERE.

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Zoom Image link HERE.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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1999 Ford Ranger Pickup Car Stereo Radio Wiring Diagram.
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