gl1200 slow cranking - voltage drop at starter


Information and questions on GL1200 Goldwings (1984-1987)
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MNAspencade
Posts: 22
Joined: Wed Aug 21, 2013 7:02 pm
Location: Jacobson, Minnesota
Motorcycle: 1985 Gl1200 Aspencade

gl1200 slow cranking - voltage drop at starter

Postby MNAspencade » Thu Oct 24, 2013 6:38 pm



I recently bought a 85 aspencade that was not running it came with a 86 interstate for parts. First off the battery was dead. With the impending Minnesota winter coming I have been using jumpers from a running car. Both starters will only turn the engine over slowly. first I rebrushed / cleaned out the starters. Same result. then took the starters to a local rebuilder - he fixed one for a bad internal post connection (likely from over tightening the cable) and declared them good. Although he said he could not check them for torque. Next I replaced the solenoid and did the blade fuse mod. Same results. After testing for voltage drops I found that when the starter switch is pressed my voltage will drop from 13.4V to 3-5V. This drop occurs in numerous testing locations, between battery terminals, both relay posts to ground, starter lug to ground. I only show about 5V at the green and yellow wires at the relay (not sure if this is correct or not) when start button is pushed. It will turn over at a decent pace with the plugs out (no apparent hydrolocking) I am getting spark at all 4 cyl. Timing looks good. I have sprayed electrical contact cleaner into the start switch - but have not taken apart. I am running out of ideas on where to look to solve this problem. It is getting to be too late to get too much shop time on her - but I would like to get it running before putting away for the winter. I have looked at viewtopic.php?f=3&t=17545&start=25 and other posts but I am running out of ideas.
Thanks



wing86new1
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Location: Notre Dame, Indiana
Motorcycle: 1986 goldwing aspencade sei
and 1978 gl1000

Re: gl1200 slow cranking - voltage drop at starter

Postby wing86new1 » Fri Oct 25, 2013 6:41 am

did you replace the "dogbone" fuse ? I have 2 of these machines a 78 and a 86 (just got) with issues of that main fuse being corroded or not passing enough current.

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virgilmobile
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Motorcycle: 1988 GL1500 I
Previously owned
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81 GL1100
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84 GL 1200 I

Re: gl1200 slow cranking - voltage drop at starter

Postby virgilmobile » Fri Oct 25, 2013 12:13 pm

Forget trying to jump the bike from the car when the bike has a dead battery....Not with the small wire sized jumpers and clamps....
Jumper cables are intended to provide a little more power for a weak battery,never a dead one...
I'll bet the jumper cables are just that...jumpers not "starting cables"
Jumper cables are usually about 6' long and are at best a #10 wire....You will never be able to crank a bike with those small wires.You just can't get 80 amps to go that far on small wires...Start cables are usually OO wire...kinda like welding cable....

Just look at the bikes battery cable...its no more than 2' long and is a large size wire...Your voltage drop is in your jumpers cables....rig up a battery setting on the passenger foot rest...I did this with a lawnmower battery....keep the wires short...if you have to extend the battery wire,use at least 4 #10 wires the same length and no more that a foot long...

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MNAspencade
Posts: 22
Joined: Wed Aug 21, 2013 7:02 pm
Location: Jacobson, Minnesota
Motorcycle: 1985 Gl1200 Aspencade

Re: gl1200 slow cranking - voltage drop at starter

Postby MNAspencade » Fri Oct 25, 2013 8:22 pm

Thanks for the responses! Yes I did replace the dog bone fuse with the blade style fuse mod. Next time I get to the shop I will dig the battery out of the lawnmower and see if I can get any results. After reading an article elsewhere about voltage drops I realized that all of my voltage tests were done from various points to either the ground terminal or a grounding point on the frame, so not any from various points ALONG the circut . Is there specific points I should be looking at ??

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virgilmobile
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Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: gl1200 slow cranking - voltage drop at starter

Postby virgilmobile » Sat Oct 26, 2013 9:01 am

Usually voltage drops are measured from the source to the load.
Eg.measure from the battery positive post to the starter lug.
Voltage drop should be less than 0.4 volts while cranking
similar voltage loss is normal on most any circuit.
if you have 4 volt loss in a length of wire,it's too small,load too large,or wire too long

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MNAspencade
Posts: 22
Joined: Wed Aug 21, 2013 7:02 pm
Location: Jacobson, Minnesota
Motorcycle: 1985 Gl1200 Aspencade

Re: gl1200 slow cranking - voltage drop at starter

Postby MNAspencade » Sat Oct 26, 2013 9:45 am

Many Thanks. The lawn tractor battery is on the charger to be sure it is full and I will check voltages later today or tomorrow. Fingers crossed.

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virgilmobile
Posts: 7650
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: gl1200 slow cranking - voltage drop at starter

Postby virgilmobile » Sat Oct 26, 2013 4:20 pm

I think you'll be supposed how fast a good battery connected direct to the bikes cables will crank it.keep us posted.

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MNAspencade
Posts: 22
Joined: Wed Aug 21, 2013 7:02 pm
Location: Jacobson, Minnesota
Motorcycle: 1985 Gl1200 Aspencade

Re: gl1200 slow cranking - voltage drop at starter

Postby MNAspencade » Sun Oct 27, 2013 8:36 pm

She Lives !! :D sort of. I did get it started tonight just for a bit while playing with the choke. Did not run very well but I still need to re hook the exhaust tubes, timing covers and fill the anti freeze. But I am happy it was running - now on to the next steps. I would like to get it running well enough to do a good warm up as to do a good winterizing. Yes, Virgilmobile I was amazed when it turned over so much easier. Voltage drop from positive on Battery to starter lug was about 0.28V.

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virgilmobile
Posts: 7650
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: gl1200 slow cranking - voltage drop at starter

Postby virgilmobile » Mon Oct 28, 2013 6:46 am

Great to hear.Now onto the next project.Post if you have problems.




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