(4) If tests made under steps d (1), (2), and (3) above show ignition system to be in good order (no units having been replaced), and ignition trouble still exists, it means that breaker points, condenser, and spark coil must be replaced with new units and engine road test made with each replacement until trouble has been located and remedied.
e. Ignition System Tests Satisfactory but Engine Starts Hard, Overheats or Misses. Clearly an indication that spark plugs are faulty. Remove spark plugs, clean with sandblast, regap points between 0.028 inch to 0.030 inch and reinstall. Replace defective plugs with new ones of correct (No. 2) heat range (par. [83]).
f. Engine Misses After Warm‐up, or When Quite Hot. Replacement of spark plugs should remedy this trouble. If it does not, then either the condenser or spark coil is at fault. Replace condenser first (par. [85]). If new condenser fails to correct trouble, replace spark coil (par. [89]).
33. GENERATING SYSTEM.
a. Panel Green Signal Light Continues to Burn Above 20 Miles per Hour. Correct faulty wiring and connections between battery and generator. Refer to [figure 55]. Inspect condition of relay and, if necessary, replace (par. [95]). Inspect brushes and commutator of generator. Clean commutator if necessary (par. [91]). If brushes are sticking in holders or badly worn, replace generator (pars. [93] and [94]).
b. Generator Output Fails to Keep Battery Charged Although Green Signal Light Behavior Is Satisfactory. Test battery: if it will not hold charge, or is defective, replace (par. [113]). If the machine is used most of the time for night operation, have a higher echelon increase the generating charging rate. Inspect brushes and commutator of generator. Clean commutator if necessary (par. [91]). If brushes are badly worn or sticking in holders, replace generator (pars. [93] and [94]).
34. ELECTRICAL SYSTEM.
a. Panel Lamps Do Not Light When Switch Is Turned On. Examine each lamp and if burned out, replace (par. [120]). Examine battery; if discharged, replace (par. [113]). Remedy defective wiring and connections ([fig. 71]). Test light switch: if defective, replace (par. [116]). Test blackout light switch (in lamp body): if defective, replace lamp (par. [114]).
b. Lights Burn Dim but Brighten Up Considerably When Engine Is Accelerated. Test battery with hydrometer. If it is not fully charged, replace (par. [113]). Remedy defective wiring, connections, and switches in circuit ([fig. 73]). If the battery runs down again after a short period of operation, have the generator output increased (refer to a higher echelon).