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HOMESERVICE MANUALSJEEP1989WRANGLER BASE, 4.2 T, STANDARD, BA10/5REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEIGNITION SYSTEM - 4.2LTESTINGCURRENT FLOW
1989 Jeep Wrangler Base, 4.2 T, Standard, BA10/5

Current Flow

1989 Jeep Wrangler Base, 4.2 T, Standard, BA10/5SECTION Current Flow
  1. Remove positive and negative wire connectors from coil. Connect ammeter between positive terminal of coil and disconnected positive primary wire.
  2. Connect jumper wire from negative terminal to ground. With ignition on, current flow should be approximately 7 amps. Replace ignition coil if current exceeds 7.6 amps.
  3. Connect ammeter to coil positive terminal and remove jumper wire from negative terminal. Connect coil Green wire to negative terminal. Current flow should be approximately 4 amps.
  4. If less than 3.5 amps, check for poor contact at 3-wire and 4-wire connectors or distributor ground screw. If current flow is greater than 5 amps, control unit is defective and must be replaced. Normal current flow with engine running is 2.0-2.4 amps. Replace control unit if not to specification.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
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