3.0L Mercruiser restart problems

Old 06-30-04, 08:18 AM
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Question 3.0L Mercruiser restart problems

With full charge on NEW battery engine starts fine and quickly. Then will not restart...acts like battery is weak or drained. Then will start after new charge on battery. Have taken Starter off and to an auto parts store to test...it draws over 220 amps...off their tester chart...not sure what it should be drawing...HELP!!!
Old 06-30-04, 08:54 AM
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Hello: kboyd. Welcome to our Boats, Sailing, Pwc's & Navaigations topic and the Do-It-Yourself Web Site.

Amperage draw of the starter is much too high. Indicates starter is defective. Likely gets hot very quickly, cranks slowly and is draining the battery(s) much too quickly.

Starter replacement or rebuild (done professionally) would be the only option.

FYI reminder to all owners:
Boat starter motors cannot be replaced with car or truck starters. They are not the same. Boat starters are sealed units to prevent sparks.

Does not matter what the starter draw is suppose to be. If current draw readings are, off the scales, as you mentioned, during testing, starter is defective.

Alternator testing is also required. Proper voltage output is required. Undercharging or overcharging conditions must be corrected, if any exists.

All possible current drain sources must be corrected too. Including but not limited to battery terminals and battery cables. Corrosion, see and unseen, anywhere located must be removed or the parts replaced.

Corrosion causes high electrical resistence to the flow of current. High resistence also reduces current recharging, excessive heat throught the entire electrical system, all electric parts and effects current draws.

The resident boat service & repair professionals may have additional helpful information, suggestions and advice. Check back on your question several times for additional replies.

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