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LH 308 coil/distributor

Started by _stcos85_ , Oct 30 2010 03:34 PM

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14 replies to this topic

#1 _stcos85_

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Posted 30 October 2010 - 03:34 PM

Been working through the LH I bought and have now got to the ignition system.

The guy I bought it off didn't fit the distributor so I refitted it setting no.1 at TDC and went to connect up the coil. noticed that the wires into the distibutor were about to snap so changed these for some new wires. connected it up, refitted the distributor but it won't give me a spark.

I am getting 12v to the positive side of the coil when the ignition is on.

added a couple of picks of the setup I have as I am not familiar with this. If anyone can advise what to check that would be a great help.

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#2 TerrA LX

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Posted 30 October 2010 - 04:54 PM

You have red and black coming from the dizzy?
Connect the black to the neg side of the coil.
Do not ground any wires, system is ground thru the dizzy.

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#3 _nemo355v8_

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Posted 30 October 2010 - 06:30 PM

do you have 12v to the coil while cranking it over, all early points holdens have 2 wires to the + side of coil, 1 for ignition on and another for cranking.
I suggest running a wire fron the + on battery to + on coil and see if it runs, if it does you need to sort out the power feed from the ignition.
If it doesnt, you got some other problem, try that first and let us know how you go.

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#4 _stcos85_

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Posted 02 November 2010 - 10:36 AM

You have red and black coming from the dizzy?
Connect the black to the neg side of the coil.
Do not ground any wires, system is ground thru the dizzy.

before I changed the wiring due to it being broken I had a green to the negative side and a red to the positive

do you have 12v to the coil while cranking it over, all early points holdens have 2 wires to the + side of coil, 1 for ignition on and another for cranking.
I suggest running a wire fron the + on battery to + on coil and see if it runs, if it does you need to sort out the power feed from the ignition.
If it doesnt, you got some other problem, try that first and let us know how you go.

I run a wire as suggetsed but still no spark. do you have any ideas on how I can check individual items?

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#5 fuzzypumper

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Posted 02 November 2010 - 11:33 AM

If you want to test the individual components, download & refrence my guide here http://www.gmh-toran...opic=42599&st=0

Edited by fuzzypumper, 02 November 2010 - 11:34 AM.

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#6 _nemo355v8_

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Posted 02 November 2010 - 07:16 PM

If you want to test the individual components, download & refrence my guide here http://www.gmh-toran...opic=42599&st=0

when you put new wires from the dissy to coil did you take note what position they came off the module on the dissy, try swapping them around if there on the wrong way around you wont get spark.

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#7 rodomo

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Posted 02 November 2010 - 08:04 PM

when you put new wires from the dissy to coil did you take note what position they came off the module on the dissy, try swapping them around if there on the wrong way around you wont get spark.

Attached Files

Module wires colours.jpg 50.72K 4 downloads

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#8 _nemo355v8_

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Posted 02 November 2010 - 08:26 PM

when you put new wires from the dissy to coil did you take note what position they came off the module on the dissy, try swapping them around if there on the wrong way around you wont get spark.

also check where those wires where they come out of the dissy, those 2 thin black ones can frey and touch on the dissy body

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#9 _nemo355v8_

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Posted 02 November 2010 - 08:31 PM

when you put new wires from the dissy to coil did you take note what position they came off the module on the dissy, try swapping them around if there on the wrong way around you wont get spark.

nice a pic. Green to neg on coil, red to positive on coil

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#10 _stcos85_

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Posted 03 November 2010 - 03:53 PM

when you put new wires from the dissy to coil did you take note what position they came off the module on the dissy, try swapping them around if there on the wrong way around you wont get spark.

nice a pic. Green to neg on coil, red to positive on coil

thanks for all the replies. I down loaded the file so will spend an evening checking things out. I have 2 wires to the positive side of the coil, one being the wire into the distributor and the other a yellow one. I will have a look to see what has been done at the connector, this may be one of my problems.

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#11 _stcos85_

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Posted 06 November 2010 - 02:47 PM

[quote name='stcos85' date='03 November 2010 - 03:53 PM' timestamp='1288763602' post='549322']
[quote name='nemo355v8' date='02 November 2010 - 08:31 PM' timestamp='1288693914' post='549149']
[quote name='rodomo' date='02 November 2010 - 08:04 PM' timestamp='1288692290' post='549138']
[quote name='nemo355v8' date='02 November 2010 - 08:16 PM' timestamp='1288689411' post='549110']
when you put new wires from the dissy to coil did you take note what position they came off the module on the dissy, try swapping them around if there on the wrong way around you wont get spark.
[/quote]
[/quote]

nice a pic. Green to neg on coil, red to positive on coil
[/quote]

I have now taken out the distibutor and checked the coil against the doc sent to ne by Fuzzypumper(thanks again for this).

The coil gives the readings expected so I then moved on the distributor. I assume I can check the reluctor in situ. can you confirm that is correct? The reading I got was 1.11 against the doc giving 1.13 so can assume this is ok.

then moved on to the ignition module and tested as per the doc.

pic 1 doc reading was 1, my reading 1
pic 2 doc reading was .623, my reading .863
pic 3 doc reading was 1, my reading 1
pic 4 doc reading was 1, my reading was 1
pic 5 doc reading was .527, my reading was .684
pic 6 doc reading was .475, my reading was .586
pic 7 doc reading was 1, my reading was 1
pic 8 doc reading was .498, my reading was .593.

can you confirm these are ok as they are all higher than the doc readings and I am not sure what would be acceptable.

I haven't stripped the distributor down yet. assuming the above readings are ok what will stripping it down achieve or is there something mechanical that could be stopping a spark being generated?

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#12 _stcos85_

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Posted 06 November 2010 - 02:49 PM

[quote name='stcos85' date='06 November 2010 - 02:47 PM' timestamp='1289018844' post='549944']
[quote name='stcos85' date='03 November 2010 - 03:53 PM' timestamp='1288763602' post='549322']
[quote name='nemo355v8' date='02 November 2010 - 08:31 PM' timestamp='1288693914' post='549149']
[quote name='rodomo' date='02 November 2010 - 08:04 PM' timestamp='1288692290' post='549138']
[quote name='nemo355v8' date='02 November 2010 - 08:16 PM' timestamp='1288689411' post='549110']
when you put new wires from the dissy to coil did you take note what position they came off the module on the dissy, try swapping them around if there on the wrong way around you wont get spark.
[/quote]
[/quote]

nice a pic. Green to neg on coil, red to positive on coil
[/quote]

I have now taken out the distibutor and checked the coil against the doc sent to ne by Fuzzypumper(thanks again for this).

The coil gives the readings expected so I then moved on the distributor. I assume I can check the reluctor in situ. can you confirm that is correct? The reading I got was 1.11 against the doc giving 1.13 so can assume this is ok.

then moved on to the ignition module and tested as per the doc.

pic 1 doc reading was 1, my reading 1
pic 2 doc reading was .623, my reading .863
pic 3 doc reading was 1, my reading 1
pic 4 doc reading was 1, my reading was 1
pic 5 doc reading was .527, my reading was .684
pic 6 doc reading was .475, my reading was .586
pic 7 doc reading was 1, my reading was 1
pic 8 doc reading was .498, my reading was .593.

can you confirm these are ok as they are all higher than the doc readings and I am not sure what would be acceptable.

I haven't stripped the distributor down yet. assuming the above readings are ok what will stripping it down achieve or is there something mechanical that could be stopping a spark being generated?
[/quote]

The battery is only just turning the engine over so if 12v is critical could this also be the problem?

sorry for all the questions but need to get it running.

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#13 _nemo355v8_

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Posted 06 November 2010 - 08:04 PM

you need a good battery as 10 volts minium at the coil is nedded while cranking, you also need the motor to be turning over with some speed so the internals of the dissy can create the pulse that triggers the module

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#14 _stcos85_

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Posted 06 November 2010 - 09:02 PM

Used my other car with a set of jump leads and got it firing but it didnt run as i havemt connected the throttle cable. The starter seemed to get stuck and when i got under the car the starter was very hot so think i will have to remove it.
It looks new so not sure that it is the correct one. This is the problem with buying a non runner, you dont know whats been done to it

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#15 rexy

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Posted 07 November 2010 - 07:37 AM

Nice way to potentially save a pile of cash as long as you are reasonably savvy.
Dont have a spare dizzy and coil to try do you? Even a crappy old points set up?