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Starting issues - electrical.

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razzle308
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Re:Starting issues - electrical. 2012/11/09 00:49:03 (permalink)
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thanks ratta.
The s/motor has been rebuilt. (guess that doesn't mean foolproof)
 
so the main v+ cable to the front wich has served well for years is 12mm(inc insul) so lets say 10mm.
The earth from batt to bod is 9mm
bod to engine is 7mm wich is wy bigger than stock and is only 15cm long
 
I think i just have to wait till it happens at home again so i can run some tests.
 
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Matt75
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Re:Starting issues - electrical. 2012/11/09 08:50:00 (permalink)
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Why don't you just replace the s/motor with one you know works?  Must be someone around you can borrow one from.
 
Or even jury rig the battery up so it's in the engine bay to see if it is your cables?
 
Sounds like it's the s/motor to me.
 
Matt 

 
My 4 door MK II Resto
http://www.classic-ford.org/cfp/tm.aspx?m=37623

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RS 2000
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Re:Starting issues - electrical. 2012/11/09 09:14:53 (permalink)
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With what you saying in previous posts it is a fu**ed starter. I have seen this issue a lot.
 The 'rebuilt' starter possibly only got a new solenoid, cleanout and a paintjob, making it test bench ok (no load) and look pretty. The problem is a lot of the places now dont do in depth rebuilds any more which makes a lot of the younger ones just not competent/experienced enough. Other times they arent honest enough to say sorry I cant get all the parts to recon this starter properly or they are just a bunch of sharks ripping you off. In any case if it has been done recently aproach the place and politely demand they sort it out. 
 
Cheers
post edited by RS 2000 - 2012/11/09 09:19:00
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rodlea
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Re:Starting issues - electrical. 2012/11/09 09:23:25 (permalink)
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Small battery cables can cause an intermitant fault as well. Even though they have worked fine for years, the heating and cooling of the cable can cause damage inside, which will at times, with the right conditions met, cause a very high resistance, thus giving you a low cranking voltage.
I would agree with either changing the cables for bigger ones or remounting the battery in the engine bay for a while and see if the fault persist.
Intermitant electrical faults are a pain and are generally a trial and error fix
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spigot
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Re:Starting issues - electrical. 2012/11/09 09:24:23 (permalink)
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The solenoid on the starter could be faulty, susceptible to heat lock, or bad supply voltage. I would first put a relay on the start circuit to make sure the solenoid is engaging with at least 12v. Next step would be to heat wrap it.
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Re:Starting issues - electrical. 2012/11/09 14:40:07 (permalink)
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razzle308




batt shows 13.3v
Then when it doesn't crank drops to like 9.0



 
I still stand with what I said earlier but I assumed that you checked voltage(while attempting to crank) Both at battery and also post solenoid cap( big terminal that is closest to the starter body). If you are still getting 9v or more post solenoid cap starter is definately faulty. This method will also check for correct solenoid operation.
If you are getting less than 9v post solenoid you then have a voltage drop problem. do this test  and report back.
 
Cheers

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razzle308
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Re:Starting issues - electrical. 2012/11/17 13:23:12 (permalink)
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So nothing final yet but I am somewhat convinced that the starter is probably not reeeaaallly quite strong enough for the new motor.
There seems to be no pattern as to when it will or wont start.
All I do know is it seems to do it most when I am away from home :-(
Started several time last night tuning and no probs. Drove to the servo for some petrol and wont start. Tried it 4,5,6 times and away she goes no hassle.
I think baybe if it is warm and stops on a compression stroke or something maybe it just quite hasn't got the guts to kick it over - who knows.\
That was the least of my dramas last night.
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phoenix 13918
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Re:Starting issues - electrical. 2012/11/17 18:10:18 (permalink)
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Is the engine modified at all, higher compression etc?
If it is you may need a hi torque starter have a look here
www.hitorque.com.au
Nick
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razzle308
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Re:Starting issues - electrical. 2012/11/17 21:06:49 (permalink)
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yeah 60 thou overbore and 10:1
I'll wait till the motor beds and see - seem to have less issues with more driving. or at least it seems to get over it quicker.
Otherwise yeah bigger starter.
Thanks for the link
#24
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