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Old 09-24-2012, 05:32 PM   #1
jmccalip
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Low voltage when cranking - NO START

Trying to get an Aprilia sl1000 running...

It cranks fast, but voltage read at battery is too low to fire injectors. It will start every time if I jump the solenoid with a screwdriver.

It reads 12.8 Volts with bike off. With bike on it drops to 12.5. When cranking, it drops to 9V. Problem is, the bike needs at least 10V to run the injectors. I've already checked the grounds and had the battery load tested at batteries plus, and it read 230cca (stock battery is 200cca).


Anyone know what's up?
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Old 09-24-2012, 05:43 PM   #2
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you might try bump jumping it....roll it down hill and dump the clutch from 2nd (with key in on position and kill switch disengaged)

edit: i just read you're able to get it started by completing the circuit at the solenoid so, my advice is moot. dunno what to tell you except that my old battery when it was dead..i mean truley dead. i would charge it and charge it and charge it, autozone would say it checks out fine too and of course it wouldnt start the bike. by this time though a small amount of acid was leaking out of the battery and you could tell it was time to go, any fluid leaking? or corrosion near the terminals?

also i know on my bike there is a green-connector a "known issue" that plagues the bike not permitting it to start up. you might check a bike centric forum specifically for your make/model of bike to see if there is a similar issue plaguing your ride. This place i have found in particular is pretty lack luster when it comes to multi-bike information (imagine that)
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Old 09-24-2012, 05:53 PM   #3
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Quote:
Originally Posted by 90degree View Post
you might try bump jumping it....roll it down hill and dump the clutch from 2nd (with key in on position and kill switch disengaged)

edit: i just read you're able to get it started by completing the circuit at the solenoid so, my advice is moot. dunno what to tell you except that my old battery when it was dead..i mean truley dead. i would charge it and charge it and charge it, autozone would say it checks out fine too and of course it wouldnt start the bike. by this time though a small amount of acid was leaking out of the battery and you could tell it was time to go, any fluid leaking? or corrosion near the terminals?

also i know on my bike there is a green-connector a "known issue" that plagues the bike not permitting it to start up. you might check a bike centric forum specifically for your make/model of bike to see if there is a similar issue plaguing your ride. This place i have found in particular is pretty lack luster when it comes to multi-bike information (imagine that)
Thanks, yes we have our "brown connector" mod for starting. I've already run the apriliaforum guys out of ideas, lol.

It could be the battery, but it still cranking fast...I don't get that. It has to be a strong battery to spin a 1000cc twin with no compression release.
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Old 09-24-2012, 05:54 PM   #4
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How old is the battery? It could just be a bad battery...having a dead cell in the battery will do just what you are explaining in the voltage drop
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Old 09-24-2012, 06:07 PM   #5
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I don't get how its spins quickly but doesn't have the voltage to fire injectors. I find that hard to swallow. The fact that can start it off the starter shows that the theory is flawed IMO. Maybe it's a short or bad ground issue. Or maybe its not spinning as quickly as you say
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Old 09-24-2012, 06:18 PM   #6
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jmccalip, If you can short the solenoid with a screwdriver and the engine starts, then it's possible that you have burnt internal contacts inside the solenoid causing too high resistance to reach your +10 VDC threshold...just a thought.

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Old 09-25-2012, 07:09 AM   #7
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+1 Brad
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Old 09-25-2012, 08:01 AM   #8
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I'm thinking solenoid too.
Good luck, let us know how it turns out.
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Old 09-25-2012, 11:07 AM   #9
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Thanks guys. I'll run a multimeter on the solenoid.

It's pretty new, but it's some crappy chinese brand off fleabay.
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Old 09-26-2012, 07:30 PM   #10
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It checks out fine. 2.5 ohms on primary(small wires), and 0.05 ohms on big wires when live.

Oh well.
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