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PostPosted: Thu Jul 14, 2016 7:51 pm 
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On the main road

Joined: Wed Jun 08, 2016 12:54 pm
Posts: 113
Country: United States
Bikes owned: RD400 T500 Titan
Hi Gents
Just picked up 74 t500 10000 miles hasn't run in 30 years rebuilt carbs purged oil lines cleaned tanks
Tried kicking over new battery spark ok pulled points cleaned them (getting new ones and condenser)
Here we go now no power to ignition no neutral light. Put meter on battery when I turn ignition on draws down to zero volts then turn switch to parking power slowly comes up to 12 volts then rear light goes on. When I checked +and- terminals positive was broke replaced and same issue. All was good till I took points out ,checked power to fuse no voltage. Thanks for all the help!


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PostPosted: Fri Jul 15, 2016 4:06 am 
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Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
Posts: 2947
Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
Start with making sure your new battery has a full charge — no point in ruining a new battery while you figure this out.

The bike may have been parked 30 years ago because of some unknown electrical problem.
The problem may be unrelated to the work you just did.

Replace the fuse & disconnect the points.
Check the voltages with the key in each position, and with the lights on & off.

Give the wiring a look over to see if you can spot any problems.
Look at the wiring near the battery box for possible worn insulation & intermittent shorts.

Its easy to incorrectly wire up the points.
There are some posts with pics on how to connect them. Will look for them when I have some time.

The wiring diagram is here:
http://www.suzuki2strokes.com/forum/viewtopic.php?f=29&t=4743

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BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
Yamaha 75 XS650
09 Triumph Bonneville SE


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PostPosted: Fri Jul 15, 2016 6:29 am 
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On the main road

Joined: Wed Jun 08, 2016 12:54 pm
Posts: 113
Country: United States
Bikes owned: RD400 T500 Titan
Thank you printed up wire diagram will check wires again everything is unmolested I'm 2nd owner just weird no power to fuse?! Watching voltage rise from 0 to 12 volts in p mode then rear light comes on the wiring can't be any simpler
did pull points wires off same gig will do what you said just weird no juice on fuse.
Thank you!


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PostPosted: Sat Jul 16, 2016 5:09 am 
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Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
Posts: 2947
Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
There is some info on wiring up the points here: http://www.suzuki2strokes.com/forum/viewtopic.php?f=2&t=11783&p=155895&hilit=points#p155895

You may have a broken wire. Look for voltages to narrow down where things don’t make sense.
If there is a point where most of the wire strands are broken, it may conduct enough current to light the taillight bulb but not enough to power everything.

A few years ago I got vintage bike that had a bad fuse. The fuse looked perfectly good — the fuse wire was broken in the end cap where you can’t see it.

_________________
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
Yamaha 75 XS650
09 Triumph Bonneville SE


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PostPosted: Sat Jul 16, 2016 7:51 am 
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AMA Superbike
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Joined: Tue Oct 14, 2008 6:47 pm
Posts: 1700
Location: Blythewood, SC, USA
Ignition switch???

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If you stroke it more than twice; you're playing with it.

Too many bikes, too much time, ENOUGH SPACE, FINALLY! Never enough money.........


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PostPosted: Sat Jul 16, 2016 10:38 am 
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Road race school
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Joined: Wed Jan 18, 2012 8:01 pm
Posts: 872
Location: North of Albany, NY
Country: USA
Bikes owned: T500R (now), T500M (30 yrs ago)
RossB wrote:
Put meter on battery when I turn ignition on draws down to zero volts then turn switch to parking power slowly comes up to 12 volts then rear light goes on.


Just where did you put the meter leads? Was the meter in the correct VDC setting? A battery should never "go to zero" volts, even if it is almost completely shot. And if it was, it likely wouldn't then recover to light a tail light.

Something is either wired/connected completely wrong, or you have a bad connection somewhere (first suspect - the original style fuse holder). Been down the road with both of those issues.


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