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Coil Pack Loom Issues - 2 Looms With Different Voltages

No Crust Racing
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No Crust Racing Grand Master

No Crust Racing

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Wasn't sure where to put this so mods can move this if needed.

Bought another loom for the CA18 as mine were all perished and cracked like most of them out there.

Car would not fire with the new loom connected, cranks fine and can see spark arcing to metal if I pull the coils out. Starts fine with the old loom so checked both looms with multimeter and found my old loom gives around 12.04v (dry cell in boot so a bit lower than full voltage as expected) and new loom is 11.95v so I'm assuming that's the issue. My wideband originally wouldn't fire up until it had a full 12v and required a direct earth to get it.

Used same earth point for both looms but I'm taking a stab and saying the earth wire (that bolts down to the coil pack frame) is possibly dodgy or I require a direct earth to chassis (though I did some quick testing and found the voltages didn't appear to vary when putting the multimeters black probe anywhere else on the body).

Before I go cutting off ends ad crimping new terminals can anyone think of any other reason why one loom would give me lower voltage? My electronics skill is self taught and admittedly rudimentary.

cheers

No Crust Racing Grand Master

No Crust Racing

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Posted

Found that the new loom had a different pin configuration, disassembled the plug, re-arranged the pins into the same order as my original loom and hey presto everything works.

My guess is the loom I bought came off an older gen CA.

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