Ranger 2.3L Ignition Fuse damaged

[Tijuas]

I only use my truck only one or two days and the fuse broke, the diagram
say is for the primary coil, secundary coil, ignition coil, Noise capacitor and PCM Power Diode
only for this 25A Fuse, i was going with two mechanics and any one can find
the problem, if a replace the fuse turn on again the truck but is very dangerous
use the truck because when i am running the truck turn off,
i think the Coil is putting Hot and damage the fuse but i dont know how Test the coil.

 

[kimcrwbr1]

If I understand correct it keeps blowing the ignition fuse? You more than likely have a indirect/direct short and can be hard to find. It is usually a bare wire somewhere grounding out. Look close at all the wires looking fo bare cracked or burnt wires and repair as necessary. Look close around the exhaust manifold is the usual place for a short. Tie any wires back away from the exhaust it is usually the O2 sensor wire that shorts out the PCM ignition circuit. Good luck.

 

[RonD]

You need an OHM meter to test the coil.

Disconnect all wires from the coil.
Key off.
Test OHMs between "+" and "-", set OHM meter at lowest setting, should be about .8 ohms.

Now put one of the meters probes on the wire that came off the "+" side of the coil and the other meter's wire to a ground, any metal part of the engine.
Should be High ohms, 0 or close to 0 mean you have a short in that wire.


Set OHM meter to highest setting, put one wire on the "+" side of the coil and the other in the center connector of the coil, the distributor cap wires hole.
Should be about 11,000 ohms, but les than 20,000 ohms.