Fusing control wires on a 1966 Evinrude Speeditwin 28HP (28402 M)

[Chris Koure]

Hi All,

I’ve Just started test/trash can running my engine. I have rewired a 1966 28 Speeditwin with the Big Red Plug as used on later years(1973 +). I fused all my control wires going back to my helm with a 5amp fuse. It did run but for 30 seconds (and a couple times after). Multiple clicking on that starter switch and choke and I popped the fuse. I want to protect those control wires but it looks like I need a bigger fuse. The control wires running to the helm are the 2 Magneto wires, Hot+ wire to key switch and choke button, Returning starter solenoid wire, and Choke wire. (protected from the Hot+ starter wire on the solenoid mounted under the cowl). My question is how big (do you think) I can go and keep those wires safe? I’m planning on trying 10Amp But I’m not sure.

I’m still futzing to insure I’ve got water flow and such so everything is still in the garage.

Thanks for reading Confused Chris

[crosbyman]

solenoid and chokes should not draw that much amps. you can always rate the amp capacity of the wires themselves and install an equal rated fused but you should measure the amp draw on choke and solenoid  wires  to see what is  drawing those amps.

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Chris Koure

[Chris Koure]

I’m not quite sure how to do that. The choke bellows are stiff and as a result I’m pushing the lower lever. (I just put a 10 amp fuse in and that is probably too big.) I’ll go back to the 5 amp and use the manual lever even though the 10amp works just to see if it blows again.

Bigger question is how quick does the lower leg spit water? I made a duct tape cup around the exit and I’m seeing nothing. Granted it runs at best 15 seconds before it stalls.

Thanks crosbyman, Chris

[joecb]

Chris, I don’t know the answer but I have a question… is this the original starter solenoid? or a replacement? The reason I ask, if by chance you have an automotive solenoid in place of the proper marine solenoid. you will have BIG fried wire problems.  The two types have very similar appearances but are wired internally totally different.

Joe B

[Chris Koure]

Thanks, I appreciate you sharing.

At this point I should stop and think. No cooling water (or cooked wires) are worth going forward and wrecking any progress I’ve made. Hopefully I can post these two pictures. If you have any other insight I’d appreciate it

Again thanks for your view on this, Confused Chris

[Phil Budne]

In your bucket photo it looks like the water impeller bulge isn’t submerged.

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[crosbyman]

amps are a current measurement  and done with the VOM hook-up in series on the suspect wires . Ssuggest you look up some utubes on how to use VOM  on the AMP scale .  Small meters  can usually handle up to 10 amps so verify your meter’s amp capacity.  respect polarity  on meer with needles. vs auto ranging meters

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[Chris Koure]

Thank you Phil and crosbyman, The water in the bucket did more than cover the horizontal intake holes on the leg But I will look again at the pump location (I don’t recall a bump/bulge)(If it pumps water that would be great.) Thanks. I will be looking at you tubes about how to measure VOM on the AMP scale, I have a couple of old meters. If the meters I have are to far gone it will be time for another as they are not expensive (I’m not needing a Fluke!)

Again Thanks to both of you for responding, Having direction helps a lot,

An apology as I screwed up the Year. It’s a 1964 (1961-1964)

Chris

[Bob Wight]

Phil is correct – in looking at your bucket photo, the water pump is not submerged.    Get a bigger and deeper bucket or barrel – the water level should be up to the side motor mount covers so the pump is fully underwater.   See attached photo for correct water level testing.

 

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."

[fleetwin]

OK, well just as a reference, the newer engines with the red plug used a 20 amp fuse.   I would surely pay attention to Joe’s advice though about the solenoid.  If problems persist, I would try to see which circuit is killing the fuse, the choke or the solenoid.

And yes, be sure that gearcase is buried deep in the water, water should be over the gearcase/exhaust hsg joint in order for the pump to work properly..

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