Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1986 Jeep Pickup J20FACTORY OEM SERVICE PROCEDURE
Current Flow Check
- Remove primary connector from ignition coil. Remove both wires from connector. Connect ammeter between positive terminal of coil and disconnected positive primary wire.
- Connect jumper wire from negative terminal to good ground. With ignition switch on, current flow should be approximately 7 amps. Replace ignition coil if current exceeds 7.6 amps.
- With ammeter connected to coil positive terminal, remove jumper wire from negative terminal. Connect coil Green wire to negative terminal. Current flow should be approximately 4 amps.
- If less than 3.5 amps., check for poor contact at connectors or distributor ground screw. If current flow is above 5 amps, the 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.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.