Question about 1990 Jeep Wrangler
This is a connection problem at the battery more than likely. You need to remove the cable terminals ( they are made of lead) one at a time & really clean the corrosion, from them, coat them with grease or vaseline inside & out & reinstall securely after doing the same to the battery post. Your Jeep is a 90 model so you may need to consider replacing both the Pos. & Neg cables to get new terminals that will securely mount to a well cleaned, undamaged battery. Years of current running through the large cables causes the same corrosion you see on the terminals to build up on the insides of the cables from the battery to the starter & sometimes from the ground terminal to the ground connections. You are describing classic, loss of contact symptom. You should check the connection at the end of the cables & clean as well.
Posted on Jan 31, 2010
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Posted on Jan 02, 2017
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