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Lost in rebuild shop Chris Craft 305K alternator .

Old 06-15-2019, 12:50 AM
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Default Lost in rebuild shop Chris Craft 305K alternator .

So I took my alternator to a small old school mom and pop auto electric shop for a rebuild and bam they lost it . Fair is fair they owe me a alternator problem is my alternator did not look like a regular automotive alternator . Question is is my alternator the same as automotive unit? I do have reverse rotation engine but the shop says alternators work no matter which direction they turn.
Old 06-15-2019, 01:23 AM
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Hello, if memory serves they will work either way, the rotor spinning inside the stator will still produce electricity, not sure about the rectifier or diode bridge, might be different, there is a chap on here who rebuilds alternators for a living so will no far more than me. Marine alternators do differ slightly from automotive ones, marine ones are fitted with a spark arrestor for safe installation in gasoline engine rooms. Hope this helps.
Old 06-15-2019, 01:24 AM
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true, alternators work either direction ,some marine alternators ave shielding for spark protection ,alternator shop should be able to sort that out for you on a replacement..
Old 06-15-2019, 01:29 AM
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Good point on the spark protection I'll mention that when they offer me a replacement .
Old 06-15-2019, 03:13 AM
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Iím the alternator guy. Most will work in either direction, many will not.

Do you happen to have twin engines? Whatís on the other one.
Old 06-15-2019, 03:58 AM
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Originally Posted by autobaun70 View Post
Iím the alternator guy. Most will work in either direction, many will not.

Do you happen to have twin engines? Whatís on the other one.
thanks for the reply , i have heard of this but never experienced reverse polarity alternator. .
can you please clarify for both me and the OP as to what the difference is when an alternator is reversed for future reference. ,diodes ?.
Old 06-15-2019, 04:05 AM
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Originally Posted by 1breakinit View Post
thanks for the reply , i have heard of this but never experienced reverse polarity alternator. .
can you please clarify for both me and the OP as to what the difference is when an alternator is reversed for future reference. ,diodes ?.
most often its the cooling aspect, and threads where the pulley bolts on. Most newer alternators are internal fan, and the vast majority spin clockwise. Even older stuff with external fans are mostly clockwise. Can be a slight difference in the windings of the rotor (some are directional, some work either way), however many counter rotating applications have reverse threads where the drive pulley bolts to the rotor. Just to keep it from backing off in use.

Regarding ignition protection, most older designs have added ignition protection. Completely unnecessary on most newer designs though, as the brush/commutator are shielded already for other reasons. Mostly protection from oil/water.
Old 06-15-2019, 04:42 AM
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The one they lost had an external fan which was the only noticeable difference that noticed. I don't know if its an unreasonable concern but do all alternators have the same mounts? I doubt they have a marine unit available , do you think a automotive unit would be safe to use in my boat? I do worry about the spark control as my boat is old and carbureted with the engine under a fibreglass hood.

BTW I would think the alternator could be found since all work is done inhouse ,they have been looking for three weeks now without luck. Crazy since I watched them tag it with my name and contact number.
Old 06-15-2019, 04:54 AM
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great explanation, thanks, on inboard ,V.drive and centermount i take the fan blade off for safety and because cooling is really not necessary,since the alternator is only used for minimal battery charging .
i never took any consideration to the thread direction.
Old 06-15-2019, 04:58 AM
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Originally Posted by autobaun70 View Post
Iím the alternator guy. Most will work in either direction, many will not.

Do you happen to have twin engines? Whatís on the other one.

It's a single engine boat with a confirmed reverse rotation engine .
Old 06-15-2019, 05:24 AM
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Originally Posted by Chris Craft Cutlass View Post
The one they lost had an external fan which was the only noticeable difference that noticed. I don't know if its an unreasonable concern but do all alternators have the same mounts? I doubt they have a marine unit available , do you think a automotive unit would be safe to use in my boat? I do worry about the spark control as my boat is old and carbureted with the engine under a fibreglass hood.

BTW I would think the alternator could be found since all work is done inhouse ,they have been looking for three weeks now without luck. Crazy since I watched them tag it with my name and contact number.
Originally Posted by Chris Craft Cutlass View Post
It's a single engine boat with a confirmed reverse rotation engine .
have any old pictures of the alternator mounted on the motor. There are different mounts, but also a lot of common mounts as well. Without seeing a picture or having a part number no telling what was on it. Some units can go on marine or automotive applications. Some canít. Without knowing what they are offering to give up there is no way to tell. Thread direction isnít a huge deal at all, as long as red lock tight is used.

Old 06-15-2019, 05:48 AM
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Unfortunately this is the only pic I have it doesnt show much
Old 06-15-2019, 06:02 AM
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Originally Posted by Chris Craft Cutlass View Post
Unfortunately this is the only pic I have it doesnt show much
Hard to tell, but assuming thatís it barely peeking out from under the valve cover on the near side?

If so, that looks like a 1g ford or really old Delco. Most anything they could give you would be an upgrade.
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Old 06-15-2019, 06:57 AM
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Most marine alternator fans I've seen have straight blades, like a marine water pump. They work either way. Threads..aren't the pulleys keyed in place?
Old 06-15-2019, 06:59 AM
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Originally Posted by billinstuart View Post
Most marine alternator fans I've seen have straight blades, like a marine water pump. They work either way. Threads..aren't the pulleys keyed in place?
almost never keyed. Straight blade fans are ok on some older stuff. But not anything putting out good power.
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Old 06-15-2019, 07:45 AM
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Shop says they have reverse fans and a spark protection shield , so I guess I'm good to go and I think it's going to be a freebie ...
Old 06-15-2019, 10:21 AM
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make sure the pulleys align with whatever alternator you get.
Old 06-15-2019, 01:55 PM
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Originally Posted by Chris Craft Cutlass View Post
Shop says they have reverse fans and a spark protection shield , so I guess I'm good to go and I think it's going to be a freebie ...
thats an easy one if they are any count at all. Loosing a tag sucks, but itís easy to do when you tear one all the way down.

If the unit they are using isnít keyed just ask them to lock tight the pulley nut. Pulley spacing should be easy to hit correctly.
Old 06-15-2019, 02:32 PM
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Chances are that boat has a single wire self exciting GM Delco style alt on it.
Old 06-15-2019, 03:45 PM
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For some reason I was thinking that they used prestolite alternators. But, I havenít worked on one in about 30 years.

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