LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 1999 >> Forward Control 7.4 J >> Repair and Diagnosis >> Electrical >> Component Locations >> Electrical Component Locator >> Miscellaneous
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Electrical Component Locator: Miscellaneous

MISCELLANEOUS

Component Component Location
Data Link Connector (DLC) (Commercial Van) Below dash, near steering column. See Figure.
Distributor (4.3L VIN W) On top rear of engine.
Distributor (5.7L VIN R) On top rear of engine.
Distributor (7.4L VIN J) On top rear of engine.
Engine Firewall Relay Bracket Left rear of engine compartment, under battery junction block.
Fuel Filter/Manager (6.5L VIN F) Rear of the intake manifold, part of the fuel/water separator. See Figure.
Fuel Filter/Manager (6.5L VIN Y) Rear of the intake manifold, part of the fuel/water separator. See Figure.
Fuel Heater (6.5L VIN F) Rear of the intake manifold, part of the fuel/water separator. See Figure.
Fuel Heater (6.5L VIN Y) Rear of the intake manifold, part of the fuel/water separator. See Figure.
Fuel Pump Prime Connector (Commercial Van) Taped to fuel pump relay breakout. See Figure.
Fuel/Water Separator (Filter) (6.5L VIN F) On rear of intake manifold.
Fuel/Water Separator (Filter) (6.5L VIN Y) On rear of intake manifold.
Glow Plugs (6.5L VIN F) On cylinder heads, below valve covers.
Glow Plugs (6.5L VIN Y) On cylinder heads, below valve covers.
Ignition Coil (4.3L VIN W) On top right side of engine. See Figure.
Ignition Coil (5.7L VIN R) On top right side of engine. See Figure.
Ignition Coil (7.4L VIN J) On bracket at rear of intake plenum.
Remote Battery Access Terminal Block Rear of right radiator core support panel.
Secondary Battery On right side of frame rail, behind engine.