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The Vintage Japanese Motorcycle Owners Group: Discussion Forums

Vintage Japanese Motorcycle Owners Group :: View topic - Suzuki T350 charging fault - advice please!


Suzuki T350 charging fault - advice please!

 
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Burnagian
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Joined: Oct 20, 2017
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PostPosted: Fri Oct 20, 2017 1:56 pm    Post subject: Suzuki T350 charging fault - advice please! Reply with quote



Hello, I'm new to this forum having recently acquired a 1970 T350 II. The bike is in nice original condition and I took it out for a shake-out ride of some 75 miles last weekend. It ran well except for being a bit smoky. Then towards the end of the ride the indicators stopped flashing, lights got dim and engine misfiring when brake light or indicators in use. Checked battery voltage which was only 10.8V. Re-charged the almost new battery to 12.8V and the bike re-started with all electrics working normally. Checked the installed battery voltages: 12.5V with ignition off, drops immediately to 11.7V with ignition switched on but engine not running, then 11.2V with engine idling. Barely fluctuates from 11.2V when engine revved. I know this should be at least 13-14V with engine running above idle, so there is a charging fault.

I did notice that the Earth (Ground) wire (Black with white tracer) to the Rectifier has melted insulation but the wire is intact. There's been a bit of splicing of wires by a previous owner around the positive side of the battery in the main loom but all joints appear sound.

Please can anyone advise how best to go about checking the charging circuit and components - I guess I should run continuity checks on all wires but how do I check the function of the rectifier and the alternator?

Many thanks.
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05c50
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Joined: Oct 26, 2007
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Location: Greensburg Pa

PostPosted: Fri Oct 20, 2017 3:37 pm    Post subject: Reply with quote

Welcome to VJMOG. I don't know too much about your bike, but here's a link to a manual and if you look at the first few pages there's some hand written notes about checking the charging system. hope this helps, let us know how you make out. http://www.suzuki2strokes.com/forum/viewtopic.php?p=85918

.......Paul

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Billybobbigbear
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Joined: Aug 25, 2017
Posts: 87
Location: New Zealand

PostPosted: Sat Oct 21, 2017 2:50 am    Post subject: Reply with quote

This might help see below links

The Link

Link 2

sounds like ya got a short somewhere

Id start at the battery positive and work may way down

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mnmrider
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Joined: May 14, 2015
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Location: Alberta, Canada

PostPosted: Sat Oct 21, 2017 5:01 pm    Post subject: Reply with quote

From what I've read, the charging system is a weak point for the GS's. But then it may be similar for the T-suzukis. The "stator papers" from the GS forum are an interesting read and may clarify some of the problems you encountered. http://www.thegsresources.com/index.php
mnmrider Smile
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kbts250m
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PostPosted: Sun Oct 22, 2017 5:57 am    Post subject: Reply with quote

You may already be on the right track. Overheated rectifier wire could be a clue. Easy to check, should have continuity one way, none reverse direction. Also, unless PO wire splices are obviously done correctly with good tight crimp connectors or better yet solder and shrink tube, just re-do them. That may or may not fix your charging issues but if not at least you've eliminated a possible cause and will save yourself future trouble.

Not much to go wrong with the charging system really. A bad stator coil is possible but it's more likely that you have a open circuit somewhere due to bad splices or a bad connection at one of the factory jones plugs. If you unplug them, give them a shot of WD-40 and plug them back in a couple times that often fixes them.

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