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something melted??

M

MacDawg productions

Well-known member
O.k, another post guys. This is where I'm at. Just reinstalled motor after build, and used the power up wires to check and make sure all my gauges were firing up before initial start up. I messed up, and mixed the polarity up, so posi went to negative, and negative went to positive on my 12volt power supply. Crap!! after about a minute of being hooked up, me playing with my gauges, I heard a pop, and a fizzle from the ecu area under the hood. Then i realized that I had the wires crossed. The sled started up fine, so I loaded it up to go to the hills to snow test it and break her in. Hoping that I didn't fry a capacitor, or the ecu. I unload it, and take it for a quick parking lot lap, and she is running like crap. The motor sounds o.k, just idling really low. And when I juice the throttle, it sounds like it hesitates, and then stalls when I get back to the truck.It also doesn't wanna go into reverse. I know I know, check the tps, but it's not that. I have a new tps, and harness and have adjusted it at the beginning of this season. Sled has been running great all year until some recent motor troubles,that have been solved, (thanks to indy dan!!). So the question is, did I fry the brain of the ol girl when I reversed the power up wires?? I might just pull the ecu out and have a look at it to see if I can see any oooz coming from any of the capacitors. Engine check light is coming on as well. Just constantly flashing, with no real sequence. What are your thoughts?
 
It sounds like you fried the capacitor. I had a brain fart testing my capacitor last season (hooked it up reverse polarity) and it popped like a firecracker. On the '06 it's mounted right by the ecm. Not sure on the '05 though.
 
anybody else? capacitor? That's the black box located beside the ecu correct?

Yes, that would be it. If you don't have a manual, let me know and I'll look up the test procedure for it. I know you charge it quickly with a 12 volt battery and then it should slowly drain down over a set amount of time. That's when I had the brain fart and hooked it up to an rv battery reverse polarity. It didn't like that at all. Go figure.
 
lol that's funny. Yeah, I can't imagine it would like it. I have the manual. I also have an extra cdi box. I should just try that. Just trying to trouble shoot before I tear into it. Thanks bud.
 
I believe the capacitor acts like a mini battery. During low rpm's it keeps your headlights and gages from going dim. It also stores a charge so when you shut your machine of for a few minutes and start her up, there is current available for immediate spark and a one pull start. Whether the capacitor bleeds of extra current, I'm not sure. 60 bucks at Babbitts. Sorry about all your troubles. If sledding wasn't so damn much fun, I'm sure their wouldn't be a 900 left on the planet.
 
So extensive snow testing today. I had an extra capacitor, so I did some bench testing, and the one that i thought was fried, was. Wasn't holding a charge properly. Made it idle a lot better for sure, but I still had an electrical demon. I traced it to the tps wiring harness. When I put a new sensor, and plug in last year, one of the wires broke off, and was causing an intermittent glich. While under throttle, it would just fart and burp. Patched up the harness on trail, and finished the testing/trouble shooting with some sweet high marks!! Thanks for the help guys. Now time to schedule a ride with the boys!!:face-icon-small-hap
 
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