Calling all total loss gurus, electricians, and electrical engineers

McDog

Other Administrator
Staff member
Location
South Florida
What is the connection on the battery side of your relay? Since it's melting your hull and not blowing a fuse I'd be looking for bypassed wires like that.

It is a power wire to a switch for a bilge pump and I like the way you are thinking John.
 
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Hi McDog

I also have had my carbon woes with my Freak, fortunately used to be a well paid electrical engineer , so will try to apply my mind

Did the mounting bolt where the burning occurred have an earth lead connected to it. (I ask this as only one out of two mounting points showed some burning..that's odd..If it did, its heating the bolt up due to a bad connection at that joint..either the surface between mounting lug and ebox is dirty, or the crimped lug has failed inside the lead..that happens a lot..For it to generate that amount of heat would mean there is also another problem with the other earth lead which goes direct from battery negative terminal to starter motor mount...test it under high current load....same issue at the lugs or the strands are broken inside the sheathing somewhere where it flexes a lot whilst riding.

Another question.....did you see smoking at that mounting point when the engine was been cranked over, (e.g. 150 + Amps drawn from the battery) or was it happening without engine running at all. (and no water flowing at all)...maybe a bit more detail here please.

Another angle .......the entire hull is carbon (highly conductive) and it has been earthed specifically at your ebox, (nowhere else in my mind) which in turn is earthed to the motor and battery.

So...as far as I am aware your battery positive leads are direct to solenoid and from there you send one to the bilge pump (via switch maybe ? or is the switch on the earth lead ) and probably another to Flame brain direct or via fuse. If no switch on positive lead to Bilge, the pump could be putting a voltage onto the hull where its mounted (i.e. faulty, wet inside) and current is making its way back to the battery via that mounting point and creating the heat.

Last thought....but left field completely....nothing to do with the battery circuits at all .....could be galvanic current flowing when you are riding (in salt water) and somehow this mounting point is the highest resistance in the whole current circuit therefore causing heat......I think you already replaced the aluminium tubes under the tray, which are destroyed by the galvanic effect of carbon/saltwater/aluminium, so now the pump nozzle or whole pump itself ( if not SS) becomes the preffered anode.....and the "problem " moves elsewhere....to the place where the hull meets its earth at the ebox.

my 2 cents
 
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McDog

Other Administrator
Staff member
Location
South Florida
Hi McDog

I also have had my carbon woes with my Freak, fortunately used to well paid electrical engineer , so will try to apply my mind

Did the mounting bolt where the burning occurred have an earth lead connected to it. (I ask this as only one out of two mounting points showed some burning..that's odd..If it did, its heating the bolt up due to a bad connection at that joint..either the surface between mounting lug and ebox is dirty, or the crimped lug has failed inside the lead..that happens a lot..For it to generate that amount of heat would mean there is also another problem with the other earth lead which goes direct from battery negative terminal to starter motor mount...test it under high current load....same issue at the lugs or the strands are broken inside the sheathing somewhere where it flexes a lot whilst riding.

It did happen at just one bolt, but I really think it was current more than heat because it drained my 480cca lithium battery. That bolt isnt attached to anything more specific than the back of the ebox the same as the other two, but for some reason all the damage was at one bolt.

Another question.....did you see smoking at that mounting point when the engine was been cranked over, (e.g. 150 + Amps drawn from the battery) or was it happening without engine running at all. (and no water flowing at all)...maybe a bit more detail here please.

I actually never saw it smoking because a group of teenagers saw it and ignored it other than to tell me about it later. It was on a stand in a carport area just sitting.

Another angle .......the entire hull is carbon (highly conductive) and it has been earthed specifically at your ebox, (nowhere else in my mind) which in turn is earthed to the motor and battery.

So...as far as I am aware your battery positive leads are direct to solenoid and from there you send one to the bilge pump (via switch maybe ? or is the switch on the earth lead ) and probably another to Flame brain direct or via fuse. If no switch on positive lead to Bilge, the pump could be putting a voltage onto the hull where its mounted (i.e. faulty, wet inside) and current is making its way back to the battery via that mounting point and creating the heat.

Power to solenoid in box. Out to flame via fuse. Out to switch to bilge infused and then to bilge and bilge is grounded to common ground with the rest of the grounds.

Last thought....but left field completely....nothing to do with the battery circuits at all .....could be galvanic current flowing when you are riding (in salt water) and somehow this mounting point is the highest resistance in the whole current circuit therefore causing heat......I think you already replaced the aluminium tubes under the tray, which are destroyed by the galvanic effect of carbon/saltwater/aluminium, so now the pump nozzle or whole pump itself ( if not SS) becomes the preffered anode.....and the "problem " moves elsewhere....to the place where the hull meets its earth at the ebox.

I dont think its galvanic current as I was riding in fresh water that day. I never had aluminum tubing of any sort in this hull. It is all pex tubing with brass fittings and stainless crimps or pvc. The hull is not grounded at any other point.

my 2 cents

Thank you so much @Freakie for this input. Your advice is appreciated. I have filled in answers to your questions above inside the quote.
 
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McDog. I got your feedback tks.....so one of the three mount points on the ebox to hull had a resistance much lower than the other two for a random reason, but enough resistance to generate significant heat once a high enough current somehow passed through that junction for some reason...........current supplied by the lithium battery whilst the ski was not running and bilge switch on the positive lead definitely in the off position......battery was dead when you went to check on the ski after kids mentioned smoke......so this is actually your lucky day.......apologies...just looking at the up side for a moment.....

The only logical conclusion imho is that somehow a positive connection from the battery or leads from it came into direct contact with the hull somewhere.. that would cause the current to flow in the manner required.so...is the positive lead very well protected between battery and solenoid.......was the hood in position or upside down venting the engine bay......touching battery ?.....did the kids perhaps try to crank the ski for a long period and the solenoid welded in closed position......similar...did they switch bilge on and leave it running......sorry....out of fresh ideas at this point. Will sleep on it. :)
 

McDog

Other Administrator
Staff member
Location
South Florida
Hood was on normal position and nothing touching battery. I seriously doubt the kids tried to start the ski. But....my son was the last one to ride ski so maybe bilge left on? But I doubt that is the culprit because the battery had already died once and been recharged that day. This was the first time the battery had EVER died on me and I suspected it was failing as it is 4 years old. The smoke and burning was after battery had been recharged and my son had ridden the ski for another hour or so before we brought it out of the water.
 

Half flip95

Formerly pondracer95
if it works correctly but is smoking and burning stuff up, id say bad connections or intermittent fault

take the ebox cover off and put a nice coat of glyptal over everything.
 
@McDog did you ever figure this out? My total loss electronics just did this to me yesterday. Had been working flawlessly for the longest time, but after a quick 10 min ride yesterday I stopped to fuel up and after fueling up, I noticed smoke coming from the electronics. Had to run and grab a screw driver to quickly disconnect the battery. Took the electronics apart at home and it was shorting at one of the mounting bolts for the starter solenoid. My solenoid crapped out on me a few weeks ago and in a pinch I bought a Cole Hersee universal one, I'm thinking that must be where the problem is because everything else looks perfect.
 

McDog

Other Administrator
Staff member
Location
South Florida
So I sat down with it at the kitchen table. I had an ocd OEM ignition and flame instructions next to me. I went through it three times and confirmed that everything is perfect. The bilge had it's own fuse but I went ahead and added another inside the ebox. I didnt get the ohmmeter out but I just went ahead and replaced the OEM relay as it is the only thing I can think of besides that I had the extra ground wire going to the battery instead of the engine which I'm not doing again.
 
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