TM 9-803 30 I/4 -TON 4 x 4 TRUCK (WILLYS-OVERLAND MODEL MB and FORD MODEL GPW) Possible Cause
Ignition primary wires, or cranking motor cables broken, or connections loose. Ignition coil primary winding open. Distributor points burned, pitted, or dirty. Distributor points not closing. Loose or corroded ground or battery cable connections. Open circuit in suppression filter.
Possible Remedy
Repair or replace and tightenr
Replace coil (par. 66). Clean or replace and adjust (par. 64). Clean and adjust; put one drop of oil on arm post (par. 63). Clean or replace and tighten. Test for trouble by removing ignition switch and coil wires, and connect together; if filter is faulty, report to higher authority.
(b) Ammeter Reading Normal. High tension wire from coil to Repair or replace (par. 69). distributor broken, grounded, or out of terminals. Short-circuited secondary circuit Replace coil (par. 66). in coil. Replace condenser (par. 64). Short-circuited condenser. Short-circuited or burned dis- Replace part (par. 64). tributor cap or rotor. Spark plugs, distributor cap, or -Dry and clean thoroughly. wires wet (shorted). Reset gaps (par. 67). Spark plug gaps wrong. Set timing (par. 65). Ignition timing incorrect. Ignition wires installed wrong in Put in proper places (par. 69). distributor cap. (c) Ammeter Indicates Abnormal Discharge. Short-circuited wire between am- Repair or replace wire. meter and ignition switch or coil. Short-circuited primary winding Install new coil (par. 66). in ignition coil. Disconnect temporarily, and reRadio filter short-circuited. port to higher authority. condenser or Repair lead or replace condenser Short-circuited (par. 64). broken lead. 76