Ignition problem; Motor starts and runs - but dies!...

Fire-medic · May 13, 2023

JannPedersen said:
"From the other end"?
IMO a coil resistance would be the same no matter which way around you measure it.
Do you mean at the end of the wires? The reading here shows approx 0,4 Ohms more than measured directly on the pick-up coil.
I´m not sure I quite understand what you mean - please help me...

Yes, I agree it should measure the same either way. I was interested in seeing what reading you got, not much difference. The reading is more-than I'd expect, the initial reading. See post #5. Have you tried it yet, installed/running? I expect the ignition box would want to 'see' a load/impedance within factory specs. I'm no E.E., (but my wife is 41+years, on 'big stuff' power generation & transmission). but my understanding is that systems want to 'read' loads for which they're designed, and other than that can cause failures. You might want to try contacting the supplier to discuss what you found in your impedance reading.

JannPedersen · May 13, 2023

Fire-medic said:
Yes, I agree it should measure the same either way. I was interested in seeing what reading you got, not much difference. The reading is more-than I'd expect, the initial reading. See post #5. Have you tried it yet, installed/running? I expect the ignition box would want to 'see' a load/impedance within factory specs. I'm no E.E., (but my wife is 41+years, on 'big stuff' power generation & transmission). but my understanding is that systems want to 'read' loads for which they're designed, and other than that can cause failures. You might want to try contacting the supplier to discuss what you found in your impedance reading.

I haven't installed it yet, as most sparepart dealers have a policy regarding electical components, that when it once has been fitted they do not accept a return/refund. And even though it is an OEM-part, it still is kind of pricy.
And yes no doubt that these electronic systems are quite delicate and sensitive.
As you suggest I have written a complaint/question to the supplier a few minutes ago.

Fire-medic · May 13, 2023

Yes, I think you need to get input from them before using the component. It should be in-spec. Replace it if it isn't. Unused

JannPedersen · May 15, 2023

Fire-medic said:
Yes, I think you need to get input from them before using the component. It should be in-spec. Replace it if it isn't. Unused

This is the answer I got from the supplier. I think it sounds a little bit odd - what do you think about that?...

I'm seriously considering ordering it (at another supplier) as the original spare part, to make sure it will be ok - even though the price is almost the double...

Fire-medic · May 15, 2023

OK my knowledge of electrical theory and function is pretty-much basic. I personally know of no reason why you would "divide the reading by two."

To 'phone a friend,' I asked an electrical engineer (my wife, 41+ years in that role) about this, and she could not provide me with a reason to perform such a calculation when measuring the impedance.

Frankly, I think that I would return the piece, and choose another supplier, and check the impedance before use. I suspect you will find that one built properly will fall within the values from the factory manual I posted earlier.

Electronics need to be operational within their design parameters to function properly, when presented with values outside of that, their function can be compromised, they won't do what they're supposed to do, and their longevity is shortened. Look what happens to a wet-cell battery when the regulator/rectifier starts sending it excess voltage, say 18 volts DC. It boils-off its water and soon fails.

If someone wants to correct me, or to offer additional input please do. I may learn something.

JannPedersen · May 20, 2023

Fire-medic said:
OK my knowledge of electrical theory and function is pretty-much basic. I personally know of no reason why you would "divide the reading by two."

To 'phone a friend,' I asked an electrical engineer (my wife, 41+ years in that role) about this, and she could not provide me with a reason to perform such a calculation when measuring the impedance.

Frankly, I think that I would return the piece, and choose another supplier, and check the impedance before use. I suspect you will find that one built properly will fall within the values from the factory manual I posted earlier.

Electronics need to be operational within their design parameters to function properly, when presented with values outside of that, their function can be compromised, they won't do what they're supposed to do, and their longevity is shortened. Look what happens to a wet-cell battery when the regulator/rectifier starts sending it excess voltage, say 18 volts DC. It boils-off its water and soon fails.

If someone wants to correct me, or to offer additional input please do. I may learn something.