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#90778 05/09/2005 4:21 AM | Joined: Oct 2003 Posts: 5,152 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Oct 2003 Posts: 5,152 | I assume this is a pre-computer HEI. It should have a terminal labled TACH where the power and ground are connected.
That connector gives the same signal to a tachometer that a point type ignition would. If you put a test lamp between that terminal and a source of 12-volts the light will flash while the motor turns if the module is working.
This is the approach I've used to test these things in the past.
The GM HEI does not require an ignition resistor and will not perform correctly if one is in the circuit. You probably won't notice the problem unless the motor is turning faster than typical street driving.
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
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