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Old 13 April 2009, 04:53   #11
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Have you checked the main earth connection on the engine block is making a good contact ?
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Old 13 April 2009, 05:38   #12
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Have you checked the main earth connection on the engine block is making a good contact ?
Is that the one that runs from the solenoid?
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Old 13 April 2009, 05:53   #13
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Is that the one that runs from the solenoid?
No, the negative lead from the battery will be connected to the engine block, make sure the connection is clean and tight.
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Old 13 April 2009, 07:52   #14
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the neg from the battery goes to the starter motor which then grounds to the block through the starter casing. I thought this was the problem but I've just had it off and cleaned it all up and it didn't solve the problem.

I have cleaned all the contacts as best I can and have taken the bottom of the starter motor off to see the "brushes". They appear to be small metal spring loaded blocks but the contact they make is good and they don't appear to be worn at all.

Only thing I can think of is that the Solenoid is stealing the current and hiding it somewhere.
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Old 13 April 2009, 08:03   #15
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Quote:
Originally Posted by slimtim View Post
the neg from the battery goes to the starter motor which then grounds to the block through the starter casing. I thought this was the problem but I've just had it off and cleaned it all up and it didn't solve the problem.

I have cleaned all the contacts as best I can and have taken the bottom of the starter motor off to see the "brushes". They appear to be small metal spring loaded blocks but the contact they make is good and they don't appear to be worn at all.

Only thing I can think of is that the Solenoid is stealing the current and hiding it somewhere.
In which case, try this. It's a bit dodgy and will create a big spark, so make sure there's no petrol anywhere under the cowl.
Take a big, old, worn out screwdriver and short across the two main contacts of the starter solenoid with it. If your solenoid is duff,the engine will spin up normally on the starter.
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Old 13 April 2009, 08:40   #16
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yeah was thinking of doing something like that. Just bypassed the starter using a volt meter. With the battery at 12.55v the starter sees 12.2v (the solenoid clicks ok) which then appears to drop off steadily to 12.1v when the key is held in the start position. I'm not sure if it would drop off more than this if the key was held in the start position.

I am going to try cleaning the motor contact with the (carbon apparently, not metal) brushes.

Beach time
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Old 13 April 2009, 08:43   #17
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In which case, try this. It's a bit dodgy and will create a big spark, so make sure there's no petrol anywhere under the cowl.
Take a big, old, worn out screwdriver and short across the two main contacts of the starter solenoid with it. If your solenoid is duff,the engine will spin up normally on the starter.
Actually Nos, I can create the same scenario by taking the battery cable off the solenoid and attaching it straight to the solenoid connection on the starter motor right? I can then use my battery master switch as my solenoid giving direct power to the starter to check its ok?
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Old 13 April 2009, 11:53   #18
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try taking the plugs out and turning it over to see if it drops off, but i would plumb for a bad earth as well
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Old 13 April 2009, 11:58   #19
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try taking the plugs out and turning it over to see if it drops off, but i would plumb for a bad earth as well
I did that and it still couldn't cope with it. Starter motor has been cleaned up inside and will try that. If it still doesn't work I will bypass the solenoid to see if the motor is ok then it narrows it down to a faulty solenoid I guess.
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Old 13 April 2009, 12:25   #20
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put jump lead straight to starter to see if it drops off, i hate to think that something inside your engine is causing it
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