Can I pick your collective brains for an engine start problem? '94 Rinker 265, mercruiser 5.7

ajj001 · May 1

Hi,
Our boat is on the Thames in London and been in a marina all winter. Now having trouble starting her, wondered if you had any advice before I call an engineer.....here goes....

Tried to start engine and just got a single 'click' with a drop in voltage at the helm
Have checked batteries and they both read 12.4v so look ok
Checked continuity across the breaker that sits above the engine, next to the slave solenoid and that looks ok
Ran a wire across the two heavy duty points on the solenoid (to effectively bypass it) and get a 'click-click-click' when turning power on.

Is it time to hit the starter with a hammer? Or is there some further testing I can do?

Thanks in advance

AJ

YYZRC · May 1

Do you have a battery booster that you can try? Just because the batteries read 12.4 doesn’t mean they are still good under load.

ajj001 · May 1

I do. Tried it a few weeks back and it didn't help......but then maybe the booster is broken....will have another shot.
Is there a way of checking the batteries effectiveness under load?

LaRea · May 1

If it's a lead-acid battery, check the water level in the battery too.

davidbrooks · May 2

Sounds like you are going down the right path to me. 12.4 v on a battery isn't necessarily a definite positive that the battery is good. Mine will read 13.3 when fully charged and 11.5 when almost depleted. Try and turn over the engine by hand with a large socket and breaker bar just to make sure the engine isn't siezed for some reason. If the engine spins, batteries are good the next likely culprit is that your starter is dead. I always love how things just decide to die over winter with no use.

Ian · May 3

Take it to get load tested. Will read 12v unloaded but give it a load and it will dive.

ajj001 · May 30

OK, been a while but weather in UK has been poor and other things have got in the way.
I got a Romondes BT200 tester on the batteries and the results show as per the amp meter, ie 12.3-12.4v. Also did an MCA test (every day's a school day) and it reads 629a and 630a across the two batteries so I figure enough power combined to crank.
Next I have taken the emergency power off switch out of the boat to give it a good clean (in previous years I've had to give it a thump occasional to close properly).
If that doesn't work (and I'm not optimistic) I think I'll call in a pro!
BTW, I haven't tried to crank it by hand.....it's a tight fit down there and a few too many beers have taken their toll!

PickleRick · May 30

ajj001 said:

OK, been a while but weather in UK has been poor and other things have got in the way.
I got a Romondes BT200 tester on the batteries and the results show as per the amp meter, ie 12.3-12.4v. Also did an MCA test (every day's a school day) and it reads 629a and 630a across the two batteries so I figure enough power combined to crank.
Next I have taken the emergency power off switch out of the boat to give it a good clean (in previous years I've had to give it a thump occasional to close properly).
If that doesn't work (and I'm not optimistic) I think I'll call in a pro!
BTW, I haven't tried to crank it by hand.....it's a tight fit down there and a few too many beers have taken their toll!

You're wrenching wrong, the more you drink the easier it's supposed to be

Rich_ · May 30

....you just might not be able to get back out

ajj001 · May 31

So, got to the boat today. Mixed results. The battery isolator switch is faulty. When in its place I get intermittent continuity test failures.
I did manage to squeeze into the engine bay and turn the engine about a quarter turn with a box spanner, so presume it's not seized. I also managed to get out!
So, bypassed the isolator switch and tried to start the engine and got a horrible grinding noise from starter, I assumed it just wasn't quite engaged so gave it a thump with a rubber mallet. I then got what I consider a 'normal' flat/low power battery click accompanied by V drop of at helm and then back again.
I then re-checked batteries with tester and now getting 'REPLACE' reading!
So, new isolator switch ordered. Both batteries back home for a 'repair' re-charge and will test again before buying new ones.

LaRea · May 31

That's progress, I guess! I had a couple battery switches that failed. Once the plastic rotor cracks, it can't hold pressure on the contacts.

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Can I pick your collective brains for an engine start problem? '94 Rinker 265, mercruiser 5.7

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