98 mustang gt help

Ilovemustangs

New Member
Oct 6, 2019
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Fort Worth
Experiencing charging issue , I have a new alternator got it tested 4 times passed each time , had the alternator pigtails replaced an re wired, brand new battery, replaced fuse link wire , still getting no charge , now I believe I have a blow fuse but don’t have a clue were to check ! Plz help ?
 
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wmburns

SN Certified Technician
Aug 14, 2009
5,876
512
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Houston Texas
Test for key on power in and out of I/P fuse #18. Use a test light that will "load" the circuit.

1996-1998 BJB & I/P Fuse panel layout

Test the LG/R wire with a VOM meter. How much power with the key on. Repeat the test with a test light.

Now disconnect the small alternator connector and test the unloaded LG/R wire with the key on.

Note, I have helped more than one person with an alternator charging problem that turned out to be a bad ballast resister inside the cluster.

Howto perform charging system voltage drop test
 

Ilovemustangs

New Member
Oct 6, 2019
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49
Fort Worth
Seamed to just be a fuse my friend but now I have a totally annoying issue. Something in my seat is killing my fan fuse. If I unplug the power seat the fuse lives but my fan will not turn on ?
 

wmburns

SN Certified Technician
Aug 14, 2009
5,876
512
204
Houston Texas
Cooling fan or inside fan?

It would help if gave the fuse number using the diagrams provided.

If looking for an educated guess, I would want to know the condition of the Battery Junction Box (BJB). I'm thinking water or rodent activity inside the BJB.