Volvo MD6A weird issue! - Page 2 - SailNet Community

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  #11  
Old 10-14-2013
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Re: Volvo MD6A weird issue!

I'm not headed down to the boat until later this week. I'll know more then. Thanks for all the help and I'll keep ya posted.
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Old 10-17-2013
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Re: Volvo MD6A weird issue!

I was able to get away today and head to the boat. My first attempt to diagnose the issue was to isolate the ignition switch, to determine if the problem was further up stream of if I need a new key switch. With the engine running I removed the wires from the ignition, and nothing changed. It seemed that this meant the issue might be in the solenoid of the starter (as stated above).

I removed the starter / generator from the engine and took it to be tested. NO issue with the starter, however this particular model doesn't have a solenoid, but the starter motor worked as it should.

My next step was to follow the positive cable from the starter, as a mechanic told me there is a pretty good chance the solenoid is external and between the starter motor and the key switch -- BINGO!

On the lazarette bulkhead I found this:



All signs are pointing to this little devil being the culprit of my problem. It's a $30 dollar part, and when dealing with a Volvo, that ain't bad!

I was able to bypass this solenoid / relay and I'm now getting power to the starter - As I should. Now, I won't know for sure if this is the only fault in the system until I replace it and try again but that's for another day.
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Old 10-17-2013
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Re: Volvo MD6A weird issue!

Thanks for the follow up... btw you should be able to check this item.. the two small spades are going to be the coil input (12 V on/off from start switch), the heavier terminals will be contacts that handle the higher amps of the starter itself. Put 12 V across the coil and an ohmmeter will 'prove' if the contacts are closing as they should. Do this out of circuit, of course
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Old 10-18-2013
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Re: Volvo MD6A weird issue!

Looks like any (Ford) solenoid would do and cheaper too.
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Old 10-20-2013
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Re: Volvo MD6A weird issue!

So I'm having trouble finding the same unit (not surprising!). I've been searching high and low, but I can't seem to find it.

The part I need is this:
Bosch 0 332 002 155
http://rb-aa.bosch.com/boaarocs/inde...33&prod_id=842

But I can only find this part:
Bosh 0 332 002 156
http://rb-aa.bosch.com/boaarocs/inde...33&prod_id=114

My question is this: Can I use the ...156 in place of the ...155 part? There are a few differences (ie, resistive load, response release voltage, etc.), but how will this effect the system? I am a civil engineer, not an electrical engineer so this really isn't in my wheel house!

And I've found some back history to my situation:http://www.oldmarineengine.com/discu.../5/132669.html
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Old 11-03-2013
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Re: Volvo MD6A weird issue!

To follow up with this issue. I was at the boat yesterday and replaced the relay with Bosh part# 0 332 002 156. BINGO! The old relay was the issue. The new one worked as it should have.

After thinking about how I may have caused this issue (so history hopefully won't repeat itself), I've come to the conclusion that I fried the old relay when I started the engine with the crank handle and forgot to turn on the key. The dumb thing is that I didn't need to start the engine with the crank - curiosity killed the cat.

Anyway, thanks for your help and although, Volvo md6's are becoming increasingly rare, hopefully someone will find this conclusion helpful.
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