Re: HEI ignition module problem
Checked all wires,from starter,alternator,distributor,tach,all good insulation and connectors and/connections.Have grounds from battery to block,block to frame,cab to block and frame,from instrument cluster to chassis,loosened and retorqued all of them.Rechecked internal distributor wiring/connections-pick up,capacitor,module,grounds.Swapped on a different coil.Fired it up and it ran maybe 10 seconds before it blew the TP45 module.Swapped to yet another coil,found a GM 990 module in the garage on another dist. core.Fired it up for another 10 seconds or so until that one blew.Got another module from Auto Zone,DR100,changed cap and rotor,pulled the wiring harness up and away from the firewall and block and inspected wires yet again,and zip tied them up away from anything.Checked wires on starter solenoid,again.Ran almost 20 seconds this time.
I've wasted 2 GM 990,2 AZ DR100,and 1 Napa TP45 ignition modules,I've got over $100 and 100 hours now tied up in this.I really need to know how to test the MSD 6a box,while I hunt down the bushing I need for my Unilite.
I can't get mt Mallory stuff back in soon enough.
What causes modules to blow?If I know I can remedy this.
I need any help with this ASAP,need truck for work tomorrow.
North Texas Chevelles
70 Chevelle Melba Rust
glorified parts car
7.86 @91(1/8 w/sbc)
JAKESHOE TH 400
Last edited by 70 beater; Dec 3rd, 06 at 10:50 AM.