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Old 04-11-2019, 18:23   #1
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Volvo Penta 2003 alternator/starter problem

Hi all,

After recently arriving at a new anchorage I discovered the salt water hoses to my heat exchanger where leaking and my alternator has been splashed with salt water and some wires corroded and come apart with one wire to the positive alternator terminal basically disappearing a smaller one not from the battery thatís intact and Not damaged. Anyone have any ideas where the two smaller wires go on the engine ? Itís a delco alternator. I know itís a general question miss some info but any help would be appreciated. At this point I canít start my engine.
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Old 04-11-2019, 18:51   #2
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Re: Volvo Penta 2003 alternator/starter problem

A long time ago, I was helping a fellow that had a Volvo engine. I donít remember which model. We wanted to start the engine with the alternator physically mounted, but disconnected electrically. No go. After an hour of going through the diagrams, we found that there was a starter relay that was GROUNDED via a pin on the alternator. Without that connection the engine wouldnít crank. My guess was that by connecting the start relay to that point, the relay was grounded when the motor was NOT running, but was at +12v once the engine started. That would keep you from trying to engage the starter when the engine was running.

Something like that would match your problem description.
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Old 04-11-2019, 18:52   #3
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Re: Volvo Penta 2003 alternator/starter problem

Here is the wiring diagram, assuming you have the factory setup. It will be different if you have an external regulator
Attached Files
File Type: pdf 2003 wiring.pdf (237.6 KB, 12 views)
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