15 Engine Electrical System - M103

Maintenance Jobs - 1986 through 1993

• 1550 - Check spark plugs, replace if necessary
• 1580 - Replacing spark plugs

Additional Information

• How a Starter and Solenoid Operate

---

Ignition system

• 15-0010 - Notes regarding working on breakerless ignition system
• 15-0505 - Notes regarding working on breakerless transistorized ignition system
• 15-0509 - Use of unleaded fuels
• 15-0512 - Replacing ignition cables with M3 cable screw
• 15-0515 - Testing ignition timing
• 15-0520 - Adapting ignition timing point with resistance trimming plug to available fuel
• 15-1031 - Replacing spark plugs - (Tech Mods)
• 15-1250 - Testing electronic ignition system with variable characteristics EZL
• 15-2093 - Removing and installing EZL ignition control unit - (Tech Mods)
• 15-2133 - Removing and installing crankshaft position sensor - (Tech Mods)
• 15-2193 - Removing and installing engine systems control unit (N16) - (Tech Mods)
• 15-3010 - Removing and installing high voltage distributor

Alternator

• 15-5010 - Testing alternator with regulator in vehicle
• 15-5032 - Removing and installing alternator
• 15-5700 - Removing and installing poly-V-belt pulley (fan assembly)
• 15-5760 - Removing and installing regulator

Starter

• 15-7100 - Removing and installing starter
• 15-7101 - Servicing starter (124.1, 124.3 as of approx 11/88)
  
• Programmed repairs - Electrical System I
  • Select complaint... Battery boils over or gases severely Charge indicator lamp lights up when ignition switched off and engine not running Charge indicator lamp does not light up when ignition switched on Charge indicator lamp shows constant bright light when engine running Charge indicator lamp glows when idling and becomes brighter when engine speed increases Charge indicator lamp lights up when idling and becomes weaker as engine speed increases Regulating voltage is greater than specification (13-14.5 V) Regulating voltage is less than specification (13 V) Charging current (A) is below specification Charging current (A) reaches specification although no load exists Generator does not charge, model 124 with engine M103 See also Group 54
• Technical modifications - Electrical System I

---