2015 FX HO electrical issues.

[Vertigo]

Short Story.
Did an engine rebuild after timing chain snapped. I FU**t-up while installing the battery (crossed cables). Replaced 30amp fuse since it burned out while connecting the battery. Now the bilge pump remains on all the time when normally shuts off after 30sec. Thought maybe a sticky relay, replace the Main relay to no avail (didnt fix). The ski runs great (I jus did the break-in) no check-engine symbol at dash, no warning light/chime sound and no codes.
Im thinking theres something wrong because all 4 relays start to get extremely hot including the ECU without even running the engine. I have to disconnect the main relay everytime I shut off the ski. The service manual wiring diagram does not show the exact fuse box (this issue are exposed in other posts). The only way to cool off the fuse box/relays/ECU is to disconnect the battery or to pull off the main relay.

Can some one can verify if this is normal? Any inputs will be appreciated.
Thanks

[Vertigo]

Problem Resolved. Somehow I shorted part of the ECU circuit when I installed the battery cables backwards. I used a clamp meter and started to pull fuses, relays and harnesses till I got a 0 volt parasitic draw. Every test leads to the ECU since the voltage dropped when I pulled one of the ECU harness. Bought a used ECU from Ebay and problem solved. Please be sure to connect the batt cables correctly...

[TimeBandit]

Glad you got it sorted-out.
Thanks for posting up your resolution.

[speeder]

curious why you rebuilt the 2015 engine yourself after timing chain. wouldn't yamaha cover it? (as others have been able to)

[Vertigo]

curious why you rebuilt the 2015 engine yourself after timing chain. wouldn't yamaha cover it? (as others have been able to)

Good Question... I went to 2 separate dealers, they both stated that the ski was out of warranty. Yamaha gives a 1 year warranty and after that you must purchase the YES (yamaha extended warranty) So I was basically on my own... I call Yamaha and basically got the same answer even thou they know about the issue, they havent issue a recall for it. I bought this ski used with only 20-25hrs back in 2016.

I have been told in other forums that few dealers have them fixed with or w/o warranty. I guess in my case would have been more expensive to fight it with a lawyer against a big corporation...

[bizeagle]

I have a 2015 FX Cruiser HO, 160 hours and it runs perfectly but I am curious if it is wise to change out the timing chain as there have been so many failed chains. How difficult is it to upgrade to the new chain and what does a dealer charge to do it? Anyone done this on an FX HO?

[Rollerdog]

I thought this was only an issue on the supercharged engines?

[Vertigo]

I thought this was only an issue on the supercharged engines?

Nope, HO too. Mine is a 2015 FX HO Cruiser.

[Vertigo]

Its up to you. If you have warranty I won't bother to do the upgrade, just wait till breaks. Now, if it breaks w/o warranty, labor can be around $1,600 (thats what the dealership estimate when I asked) Basically the upgrade consists of 2 camshaft sprockets, timing chain, timing chain guides and a new crankshaft. Some reuse the crankshaft (yes, you can re-use it but it but the new timing chain is beefier and will not seat perfectly on the original crankshaft). I did the repair on mine by my self. I spend close to $4,000. Upgrade kit fluctuates around $1,300 but I have to spend more for broken parts such as valves, valve guides, gasket/seals kit, bearings, hardware, machine shop (for valve guide replacement), tools and few other parts.

[bizeagle]

Nope, HO too. Mine is a 2015 FX HO Cruiser.

How many hours were on your motor when the timing chain blew? Were there any symptoms before it went out?

[Vertigo]

Around 109 hrs. No symptoms at all. I was just accelerating and around 45-50mph it just shutoff like pulling the lanyard key off. It crank normally but no combustion at all of course. There's a youtube video where you can pull the valve cover and inspect the chain to see condition or broken linkages.

[bizeagle]

Thanks for the advice. The inspection looks simple enough in the video, so I will definitely do it. If I see any flaws, I will take to the dealer and lobby Yamaha for a warranty claim.