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Page 16 of 17©2008 Edelbrock Corporation
Catalog #71900
Brochure #63-0473
Rev. 08/08 - AJ/mc
Controller Wiring
Controller power and ground wires should be routed directly to the battery or other isolated power source. For
excessive distances, supplied power wires should be replaced with heavier gauge wire. Two red wires are supplied
for wiring the progressive controller; the larger diameter is for the 12 volt supply, while the thinner wire is for the +12v
Timer output function. Nitrous toggle switch and solenoid relay power and ground wires should be routed directly to
the battery. All solenoid power and activation wires should be routed as far from other chassis electrical harnessing
as possible. Special attention should be taken when routing wires through firewalls and in the vicinity of ignition coils,
secondary wires, or the distributor. In extreme cases, shielded wire may be necessary for solenoid grounds.
(Shielding should be grounded to source on wire opposing controller.) NOTE: Static suppression ignition wires
and resistor type spark plugs are highly recommended for use with this controller.
Troubleshooting
1 - Engine running rich while using progressive controller.
A - Starting percentage too low for a given bottle pressure and solenoid combination (only fuel solenoid
opening).
B - Fuel pressure too high for fuel solenoid to operate correctly when pulsating.
C - Progressive fuel output set to ON causing a too aggressive fuel curve and rich surge condition.
D - Clogged nitrous filters
E - Insufficient bottle pressure
2 - Nitrous seems to delay after activation.
A - Improper nitrous delay timer setting.
B - Starting percentage too low for a given bottle pressure and solenoid combination (only fuel solenoid
opening).
3 - Nitrous surges during operation.
A - Engine too rich, improper bottle pressure, fuel pressure, fuel supply, jetting, ignition timing or spark
plug heat range.
B - Malfunctioning or contaminated solenoids.
4 - Nitrous turns OFF during operation.
A - Too much current draw from solenoids. The progressive Fuel and Nitrous outputs are rated at 45
amperes each, too much current draw may cause the controller to cut out.
B - Battery voltage too low. Minimum battery voltage at any time with all systems active is 12.0 volts.
C - Improperly set wide open throttle switch. Verify WOT switch is mounted securely and is completely
depressed at wide open throttle. Inspect throttle cable and linkage.
D - Poor wiring connections or grounds.
E - RF / EM interference from ignition system or other electronic device(s). See preventing EM / RF
interference section on previous page.