Testing the HR688 Module
Every HR688 Ignition Box is test run on a vehicle before it leaves our shop. If you should encounter a crank no start condition then follow these steps to trouble shoot the problem.
Internal Wiring Diagram
Check all soldered connections at the pins and the tabs on the Module. Inspect them carefully to be sure there are no possible shorts between any of the tabs on the module.
TEST 1
Using a simple Continuity tester touch one of the probes to the female side of the distributor connector the other to the terminal marked "W" which has the white wire attached as shown. You should have continuity. If not you need to check the plug to be sure that pin is inserted properly in the plug socket.
TEST 2
Check continuity between the male pin of the distributor connector and the tab on the module marked "C" and has the yellow wire plugged into it. If not Check the plug pins.
TEST 3
Pin "C" on Module to Negative side of coil, if no continuity check coil connections and again the pins and socket alignment in the plug.
TEST 4
With the key in the "Run" position check voltage at the "B" terminal of the module, it should read Battery Voltage. Turn the key to Start and crank the engine, the Voltage should be the same as battery voltage which when cranking usually drops to 10-11 volts. You must have voltage here in both the Run and Start positions of the Key switch.
Test 5
The Positive side of the coil also needs to read battery voltage in both Run and Start positions.
If everything checks OK then remount the box, do not unplug it install the supplied plug hold down machine screw, reinstall the backing plate and install the unit back in it's mounting position. With your continuity tester place one probe on the bare metal of the base plate and to the distributor housing, you should have a continuity. Place one probe on the clear area of the FBO Logo and the other to the backing plate, again you should have continuity.
The engine should start, if not call us. Feeding direct battery voltage to any terminal other than the center pin will cause the module to fail and is not warranty. If you making any changes to the wiring or installing a new electronic wiring harness be sure and remove the ground terminal from the battery to avoid any possible mishaps. Just to be sure use your volt meter, the only terminal in the plug that should read 12V is the blue wire/center pin.
541-942-5920
This page posted 8.10.11