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  #1 (permalink)  
Old 04-05-2010, 10:06 PM
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Big Dog Starter problems

A friend of mine has a 2002 Big Dog Mastiff with starter problems of course. He bought a Spyke starter ( 1.8 kw ) and I went to his house to help him put it on. Well needless to say it still won't start. I checked the voltage at the starter and we are getting power to the soleniod ( 12.37 volts ) when the start button is pushed and we are getting 12 to 13 volts to the starter post but it still won't start. Like I said this is a brand new Spyke 1.8 starter. He also has a 300 cca battery. Any suggestions?
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Old 04-05-2010, 10:14 PM
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You say it won't start, but what exactly is it doing? Clicking? Grinding? Have you tried a 10ga jumper wire from the solenoid to the starter post?
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Old 04-06-2010, 01:42 AM
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Quote:
Originally Posted by graveys250 View Post
I checked the voltage at the starter and we are getting power to the soleniod ( 12.37 volts ) when the start button is pushed

and we are getting 12 to 13 volts to the starter post but it still won't start.

He also has a 300 cca battery.




How much voltage drop @ the battery when you hit the button?



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Old 04-06-2010, 07:32 AM
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Check and recheck your grounds, make sure they're all clean and free of oxidation/corrosion. Might consider pulling the solenoid cap and making sure the contacts engage when the starter button is pushed in. Disconnect the btry before doing this...
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Old 04-06-2010, 09:36 AM
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Simple!

Hey, you need look no further that what Merlin posted.

Get a new battery, or at least charge the battery to minimum 12.7 volts after it sit for a few hours to rid itself of the surface charge. That can fool you.

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Old 04-07-2010, 02:33 PM
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Thanks for all the replies. I work two jobs and it is hard for me to get on here sometimes. I will check the voltage drop on the battery tonight. the only noise you hear when the button is pushed is the relay. I will pull the battery out of my bike and take it with me. I will post what I find out. Thanks.
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Old 04-07-2010, 09:25 PM
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Well took my battery out to my buddy's and tried it. No luck. I ran a pigtail off of the soleniod. When it was not hooked to the soleniod we had 12.24 volts when the start button was pushed. When the pigtail was hooked to the soleniod and the start button was pushed the voltage would only be .07 volts. It has a Thunderheart wiring harness on it and now I was wondering if it could be the relay on the bottom of the harness not working when it has a load on it ?
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Old 04-07-2010, 10:57 PM
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Quote:
Originally Posted by graveys250 View Post
No luck. I ran a pigtail off of the soleniod. When it was not hooked to the soleniod we had 12.24 volts when the start button was pushed.

When the pigtail was hooked to the soleniod and the start button was pushed the voltage would only be .07 volts.

It has a Thunderheart wiring harness on it and now I was wondering if it could be the relay on the bottom of the harness not working when it has a load on it ?
What do you mean you ran a pigtail off the solenoid? To where?

If you want to jump it, run a 10 gauge wire from the pos. battery term to the relay term. (spade connector) on the solenoid

But it doesn't really matter because ALL of your voltage readings are too low

You're gonna have to charge your battery or get a new battery before you can do anything else

And that's probably your only problem, anyway



BTW the starter relay is either good or bad - there's no in between
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Old 04-08-2010, 04:58 AM
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And, if you are using a TH micro-harness / controller, the start relay is embedded in the module. You do not need an auxilliary relay. Go back and check your wiring and condition of your battery.
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Old 04-08-2010, 03:33 PM
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The pigtail I ran off was from the soleniod terminal. I was using a piece of #10 THHN. I used it to hook in between the soleniod terminal and the wire from the relay so I could check the voltage drop on the wire when the button was pushed.

I don't understand about ALL the voltages being to low. The battery is putting out 12.24 volts. It is the battery out of my bike and it starts it just fine. It is a 113 with compression releases though.

I did jump the soleniod to the battery and it fired the bike right up. That is why I was wondering if it is the relay.

I hope this info helps.
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Old 04-08-2010, 06:49 PM
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Quote:
Originally Posted by graveys250 View Post

I did jump the soleniod to the battery and it fired the bike right up. That is why I was wondering if it is the relay.
If that's the case, then yes - the relay is bad
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Old 04-08-2010, 11:00 PM
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Thanks for all the info. I will try the relay and post the results. I probably won't be able to try it till Sunday evening.
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Old 04-09-2010, 06:25 AM
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BD says you need 12.8 v to start the bike, but I had a shitty battery on mine, running 12.2-12.5 for over a year, and it always started just fine, but I used a plunger switch right on the solenoid. I do know that the TH module will give you all kinds of grief if your battery is low, but more so on the newer models.
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Old 04-13-2010, 09:25 PM
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Well it was the relay. I got another one ( same one Toyota uses in their cars) and it kicked right in. Now we are having another problem.
When I go to start it and the jackshaft comes in contact with the gear it stops, but the bolt that goes inside that screws inside the starter keeps spinning.
The old starter had the 1/4 20 bolt in it but the new starter needed the 10 32 bolt.
I just tapped the 1/4 20 bolt down to 10 32 to make it work.
Does anyone know if I will have to buy a different jackshaft to go with this starter?
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Old 04-14-2010, 05:48 AM
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You have assembled the jackshaft incorrectly.

The intermediate part that has internal splines should prevent what is happening.

The spinning bolt indicates the starter is turning but not transferring to the pinion gear.

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