How to / DIY > Engines
Lister JP2 starter motor
cobbadog:
Yes, you need to confirm the starter motors voltage. If it is a 24v and you are feeding it only 12v that will give you the problem you mentioned.
Next is your battery. Have you done or had a 'load test' on the battery? If it has a few bad cells then this too will give you the same problem.
Is the battery fully charged and what volts is it holding? You should have at least 12.8v - 13.5v or there abouts.
Are ALL of your connections clean and making good firm contact at all connections? Sometimes a battery lead may not be carrying the full load due to poor connections at either or both ends.
Earth, earth and earth. One of the biggest problems with electrics is a bad earth. If it doesn't already run your earth from the battery to the engine block or even to the starter bolt if you can and make sure it is clean.
Is the positive lead to the ignition then from your ignition switch to the starter solenoid heavy enough? If this lead is too light in gauge then again a possible issue can be made.
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