Batteries - Cleaning
Glow Plugs - Testing
Disconnect the wire lead from the glow plug terminal
on the HEAT-START switch.
Install an ammeter with a capacity of over 75 amps,
in a series, between the disconnected lead and the
terminal on the HEAT-START switch.
Turn HEAT-START switch to HEAT.
Observe the ammeter. Each 12 volt glow plug draws
approximately 12.5 amperes and each 24 volt glow plug
draws approximately 6.5 amperes. The ampere draw of
one glow plug multiplied by the number of engine
cylinders will be the total
Installing Glow Plugs
Disconnect the lead wire at the defective glow plug.
Remove the defective glow plug.
Apply anti-seize compound to the threads of the new
Install the new glow plug and tighten to a torque of
45 to 53 N (10 to 12 pounds feet).
Turn the HEAT-START switch to the HEAT position
and observe the ammeter reading.
Loosen and remove cable clamps from all battery
Clean all battery terminals.
Clean all cable clamps.
Install and tighten cable clamps to battery terminals.
Coat cable clamps and terminals with grease.
ampere draw of the glow plugs in the engine. A low
reading indicates one or more defective glow plugs.
If a defective glow plug is indicated, disconnect one
glow plug lead at a time.
Turn switch to the HEAT position. Observe the
ammeter. Reconnect the lead.
The glow plug that does not change the reading on
the ammeter, when the switch is turned on, is the
defective glow plug.
Release the switch.
Install the lead wire.
Turn the HEAT-START switch to the HEAT position.
The reading should be increased. If the reading is the
same, check the glow plug wiring.
Disconnect the test ammeter.