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| No spark after complete replacement of wiring https://ausmini.com/forums/viewtopic.php?f=2&t=99487 |
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| Author: | Chevrons [ Fri Nov 22, 2019 4:21 pm ] |
| Post subject: | No spark after complete replacement of wiring |
Engine was removed, with complete rewiring done and motor was rewired into the brand new harness. Car is a negative earth vehicle and we now have no spark from the coil and on replacing the coil we now find we get a single spark from the coil through the distributor but we've used another non mini coil from a negative earthed car to get a spark. Wondering if it is because the original coil & distributor were set up in an odd way to compensate for the car having negative earth. It has electronic points in the distributor. Battery voltage while cranking is 10.8 volts. Any suggestions?? |
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| Author: | 9YaTaH [ Fri Nov 22, 2019 4:40 pm ] |
| Post subject: | Re: No spark after complete replacement of wiring |
If you have checked the wiring, I suspect the electronic points... |
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| Author: | Chevrons [ Fri Nov 22, 2019 4:55 pm ] |
| Post subject: | Re: No spark after complete replacement of wiring |
I thought that maybe the problem... But still does not explain why I cannot get even a simple spark from the coil when I bypass the points and connect a spark plug to the lead on the coil, earth the spark plug then short the negative side of the coil to earth intermittently to simulate original mechanical points... That should produce a spark but does not? Both the distributor and coil are relatively 'new'..... Thinking there is something I've missed? |
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| Author: | simon k [ Fri Nov 22, 2019 5:25 pm ] |
| Post subject: | Re: No spark after complete replacement of wiring |
you've kinda changed too many things to be able to point at any one thing... I'd go back to the original distributor and coil and confirm that the engine will start and run, then you'll have a known starting point to move to the electronic dizzy there shouldn't have been anything odd done to make it run with negative earth. |
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| Author: | Chevrons [ Sat Nov 23, 2019 6:32 am ] |
| Post subject: | Re: No spark after complete replacement of wiring |
The only thing that was done was the old wiring loom was been replaced. The coil and dizzy are the original ones that were on the motor?? A mystery..... |
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| Author: | FNQ [ Sat Nov 23, 2019 9:01 am ] |
| Post subject: | Re: No spark after complete replacement of wiring |
Just have to be systematic and change/test only one thing at a time i would start by checking the loom at coil feed - is old one ballasted and new one not or vice versa etc then in approximate order 1. earth strap- 2. power at coil 3. coil lead 4. Dizzy earth if required - sometimes have to scratch away some paint 4 HT leads - less than 5 ohms ( or 5000 or 5 somethings .... i can't recall) then i would swap out parts one at a time swap the coil out for a correct replacement then i would check electronic points ( there is a chance that if you kept the ignition turned on for an extended period then your electronic points fried as an separate issue to say dead coil. hope it is something simple Cheers |
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| Author: | 9YaTaH [ Sat Nov 23, 2019 10:35 am ] |
| Post subject: | Re: No spark after complete replacement of wiring |
Oops... |
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| Author: | drmini in aust [ Sat Nov 23, 2019 10:54 am ] |
| Post subject: | Re: No spark after complete replacement of wiring |
I'd toss them if over 5000 ohm (5K ohms). |
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