50 amp braker

tttiger652

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I have a 2003 volvo penta 5.0 started engine this morning then shut off, tried starting it again but no electrical power to anything, no lights, radio, no nothing, no start, no outdrive. Lift. The oil beeper would sound but as soon as I tried to start the engine the 50 amp breaker would pop , even when I tried to lift the out drive by itself. Thinking of replacing the breaker. Battery fully charged.
 

alldodge

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With the breaker popping it's more likely the the starter is the issue but things need to be tested.

Can try to jump the starter at the solenoid. If it cranks then it's most likely the breaker, but be ready for smoke if the starter is shorted
 

Chris1956

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Normally a 50A breaker (600watts) is not enough to fuse a starter. They can easily pull 200A on a 5.0L motor in normal operation. Starters are therefore usually not fused.

I would trace the breaker wire and see where it goes. Power Trim and slave solenoid, plus the balance of the dashboard stuff will likely be powered by that fuse. Of those, only the PTT system will normally pull close to that much power. If it is not the PTT system, look for burnt spots (and smell) under the dash and in the bilge, and the associated bare wire short.
 

tttiger652

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I replaced the 50 amp breaker and everything operated even the outdrive raised, but the starter, must be going to ground, all it does is click then breaker pops off again,
 

Chris1956

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Gee, that implies that the starter solenoid is shorting, I would think, as starters are not usually fused. MerCruiser's have a slave starter solenoid. that would be a culprit, if you have one. Not sure you motor has one.
 

alldodge

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The starter solenoid and slave relay power comes after the 50A
 

tttiger652

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Gee, that implies that the starter solenoid is shorting, I would think, as starters are not usually fused. MerCruiser's have a slave starter solenoid. that would be a culprit, if you have one. Not sure you motor has one.
My solenoid is mounted on the starter like a GM, engine is a Volo penta Serria, MerCruisers are ford's, they have a separate solenoid mounted some where else
 

Chris1956

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MerCruisers have not used Ford engine in a very long time. They use either native blocks or GM blocks. A lot of the MerCruiser's blocks have a solenoid on the starter, plus a slave solenoid mounted on the lock or manifold.

BTW, I am just trying to help you find your short... Not many items would survive after drawing 50A of power.
 

tttiger652

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The starter solenoid and slave relay power comes after the 50A

MerCruisers have not used Ford engine in a very long time. They use either native blocks or GM blocks. A lot of the MerCruiser's blocks have a solenoid on the starter, plus a slave solenoid mounted on the lock or manifold.

BTW, I am just trying to help you find your short... Not many items would survive after drawing 50A of power.
Ok, thanks for the info, your right, which manifold, intake or exhaust. What is the lock that your speaking of, I don’t have a schematic drawing on the electrical circuit, may have to go to a boat shop to get one. I will be heading that way today anyway. Ordered a starter button to jump start starter, should be in today, I have lots of time to try to figure this out, thanks for you patience.
 

tttiger652

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Thanks for the pic
Ok, but starter button on and solenoid clicks, and something you can hear it hit the flywheel, but. Don’t spin the engine. I pulled the spark plugs out also, I can turn the engine by hand , a little tough with the power steering pulley . I would think that the starter should be spinning right before it hits the flywheel.
 

tttiger652

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Ok, but starter button on and solenoid clicks, and something you can hear it hit the flywheel, but. Don’t spin the engine. I pulled the spark plugs out also, I can turn the engine by hand , a little tough with the power steering pulley . I would think that the starter should be spinning right before it hits the flywheel. Starter solenoid not energizing
 

alldodge

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What might be happening is your hearing the relay click but the relay is ot providing power to the starter solenoid

Need a voltmeter to find out if the starter solenoid is actually getting 12V when key is turned to start
 

Chris1956

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If that 5.0L motor is a small block chevy, it often has a starter that has s solenoid that when actuated, pushes the starter gear into the flywheel ring gear. Until the gear is engaged, the starter does not spin. Specifically, when the starter solenoid is energized, it magnetizes and pulls a plunger down a tube, pushing the gear into the starter.

I have seen starter solenoids that jam in the tube holding the plunger. When that happens, you get a click from the starter solenoid, but nothing else.
 

dubs283

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Ok, but starter button on and solenoid clicks, and something you can hear it hit the flywheel, but. Don’t spin the engine

Did you try this starter button applied directly to the primary post of the starter solenoid (the solenoid attached to the starter)?

If so, the starter has failed and needs replaced

Otherwise follow dodge's advice from post #15 and measure voltage at the primary post on the starter solenoid when attempting to turn the engine over
 

tttiger652

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If that 5.0L motor is a small block chevy, it often has a starter that has s solenoid that when actuated, pushes the starter gear into the flywheel ring gear. Until the gear is engaged, the starter does not spin. Specifically, when the starter solenoid is energized, it magnetizes and pulls a plunger down a tube, pushing the gear into the starter.

I have seen starter solenoids that jam in the tube holding the plunger. When that happens, you get a click from the starter solenoid, but nothing else.
Ok thanks for the info
 

tttiger652

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Did you try this starter button applied directly to the primary post of the starter solenoid (the solenoid attached to the starter)?

If so, the starter has failed and needs replaced

Otherwise follow dodge's advice from post #15 and measure voltage at the primary post on the starter solenoid when attempting to turn the engine over
Ok thanks will try that.
 

tttiger652

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I want to thank Chris and alldodge for the help, I pulled the positive battery cable off after checking the voltage and the head flew off, replaced cable and all is good, now I want to replace my temperature sensors. I have one that goes to the gauge and one that sets of the alarm when it overheats and would like to know at what temperature it goes off. Do you guy know where I can purchase them and the stock number, thank again. Ps: I have a
GS205SF model boat, 5.0 ,2003
 
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