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#1
11-05-2005, 05:32 PM
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voltage to trigger points - 74 450 sl
does anyone know for certain the voltage specified for power to the trigger points. it comes out of the ecm on terminal 12 (yellow/black)and is the main power to the trigger points. i've heard it is regulated 5v but want to simulate it properly before buying a new ecm. it's a '74 450 sl
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#2
11-06-2005, 05:00 PM
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Quote:
my books are at the shop. whats going on or whats the problem? never seen a need to check this. car running? missing? give us a hint. george
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#3
11-07-2005, 08:52 PM
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voltage to trigger points
thanks, george - the reason is, i do not have power to my fuel inj. points , at the distributor nor all the way back to the ecm. i do have power from both fuel inj. relays, on the black wires, into the ecm. vehicle currently will not run, i am in the process of a semi-restorartion after (too long) sitting. started and ran a few times til lost power to injectors and i traced it back to the ecm. (yes everything's grounded, yes the points are working) unless i need another power source into the brain that i am not aware of, i'm pretty sure it's burnt (opened it and found several melted spots and a burnt smell). the thing is, i'm not sure how much for an ecm and would like to run this car for a while to see what my other problems may be before shelling out for it. i wanted to give an alternate source to the trigger points of the correct voltage because i believe 12v on a 5v system could certainly damage either the points or the injectors or both. a pin voltage chart would be most enlightening. thanks for your reply.
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