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Old 10-31-2012, 05:13 AM   #1
Martian OP
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Location: Elmdale, Kansas, USA
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'93 R100 Dead In Texas

Some of you may have seen my thread "Airhead On the Move". Well, we stopped moving (under her own power, anyway) yesterday evening.

The bike was running great until I stopped on the side of the road to let my butt re-inflate after 400 miles/9 hours of riding. When I climbed on to continue the last 50 miles, she decided she'd gone far enough. Thankfully, my BIL has a trailer, and I had cell phone reception. So, getting the bike here where I can work on it was easy.

Here's what happens: When I turned on the key after my break, everything was normal; all lights came on bright. As soon as I hit the start button, there was a 'click', and then nothing. All lights went out. Hitting the start button again had no effect but to make the tack move to about the 2000 rpm position while the button was pushed. After scratching my head for a few minutes, I tuned the key back on, and the warning lights werre back, and the headlight was on so, I hit the button; everything goes away, and the tack jumps.

Here's what I've done: Being as I was on the side of the road and help wasn't far away, I only performed the minimal checks of connections that were easily accessable; battery, ground terminal, and a quick look-see under the tank. Wiggling and pulling wires doesn't change anything.

I was in such a hurry to be on the road that I forgot my meter; so I can't give you voltages yet, but as soon as it gets light, I'll use my BIL's meter to check the battery voltage. I'm hoping its the battery!

Just in case, though, if anybody knows an airhead owner who may have some spare parts around the Bryan/College Station area of Texas, I'd sure be interested in hearing from you. The bike is currently on my BIL's trailer near Carlos. TIA
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Old 10-31-2012, 05:25 AM   #2
kadesean
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Mikey, of Martindale Motorcycle Works in Martindale, 120 miles away. 512-357-2842

http://martindalemotorcycleworks.com/A55A76/home.nsf
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Old 10-31-2012, 05:29 AM   #3
Beater
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Sounds like you're not charging. Dead Battery.
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Old 10-31-2012, 06:04 AM   #4
CurlyMike
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PM sent your way...
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Old 10-31-2012, 07:13 AM   #5
Wirespokes
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The exact same thing happened to me with a spotty connection at the diode board. It's the connection at the right (looking at it) where the large wire plugs into the hot side.

If the battery shows 12.5 volts, do a load test. See how far the battery drops when hitting the start button - shouldn't go below something like ten volts.
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Old 10-31-2012, 07:20 AM   #6
Airhead Wrangler
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Try jumping it. I'm guessing a bad battery (or maybe charging system).
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Old 10-31-2012, 07:35 AM   #7
Martian OP
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Quote:
Originally Posted by Wirespokes View Post
The exact same thing happened to me with a spotty connection at the diode board. It's the connection at the right (looking at it) where the large wire plugs into the hot side.

If the battery shows 12.5 volts, do a load test. See how far the battery drops when hitting the start button - shouldn't go below something like ten volts.
I get 12.5 battery volts. There is a relay buzzing in the cluster of three under the tank. It is the inside rear one. I also found that a packrat had been trying to set up house in the diode board area, but none of the wires look chewed or eaten through. Now, I don't have any idiot lights.

I'll chheck the big black wire at the diode board. Thanks.
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Old 10-31-2012, 07:50 AM   #8
Airhead Wrangler
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Quote:
Originally Posted by Martian View Post
I get 12.5 battery volts.
Be sure to check the voltage under load too when you push the starter button. Bad batteries will often show good voltage under no load condition, but when you hit the starter button they drop to 8V or less even. The buzzing relay thing and rodent sabotage could also be it though. Good luck.
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R80ST Gets The HPN Treatment
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Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.

Airhead Wrangler screwed with this post 10-31-2012 at 08:18 AM
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Old 10-31-2012, 08:09 AM   #9
Horsehockey
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Remove the tank. Locate the starter relay. Unplug the relay and clean the connections. Insert the relay and remove it again - repeat this a couple times. Then test. If it isn't corroded contacts on the starter relay, I'm with the dying battery theory.
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Old 10-31-2012, 08:12 AM   #10
Martian OP
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HH, is the starter relay the aft one of the two black relays next to the grey relay?
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Old 10-31-2012, 08:13 AM   #11
Wirespokes
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A word of caution - don't cause a relay to click continuously. The arcing will kill it. Then when the original fault is found and handled, the relay won't work and will need to be replaced. This is also true of the starter solenoid which in essence is just a large relay.
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Old 10-31-2012, 08:19 AM   #12
Horsehockey
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Quote:
Originally Posted by Martian View Post
HH, is the starter relay the aft one of the two black relays next to the grey relay?
Not sure on a '93. It's the aft of two on my '75. Someone might help with a pic.
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Old 10-31-2012, 08:21 AM   #13
Martian OP
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Okay, I'm going to get a new battery. Is the relay available from any parts store?

With a charger on the battery, the solenoid clicks. But, I also have the tach going up to about 4000. Why would the tach react like this?
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Old 10-31-2012, 08:25 AM   #14
Airhead Wrangler
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Quote:
Originally Posted by Martian View Post
Okay, I'm going to get a new battery. Is the relay available from any parts store?

With a charger on the battery, the solenoid clicks. But, I also have the tach going up to about 4000. Why would the tach react like this?
If the relay is buzzing, then it could be rapidly switching current to the coil on and off which the tach would read as revs. Pure speculation though.
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Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.
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Old 10-31-2012, 08:25 AM   #15
Bill Harris
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Glad you made it to a safe haven. This is your R100R that's been GS-ified, right?

"Airhead on the Move" http://www.advrider.com/forums/showthread.php?t=837618

The "no idiot lights, no starter joy, nuttin" all of a sudden and intermittently sounds like a bad connection or fuse (maybe in the headlight shell). There is one Green and Green-Black wire that powers idiot lights, starter solenoid, horn, etc that can cause that symptom. On my /5 I changed out the Fairing recently and left a horn wire loose during the transition and that Gn-Sw wire grouned out and blew a fuse (all of a sudden, at the grocery store at night) and did the same thing yours is doing. Either that, one of the new-fangled "headlight always on" relays. I don't have an R100R schematic, but I'm digging online, and I'll look closely.

Xerox, fold up and carry a schematic in a baggie. It'll save your bacon some day.

Battery or Alternator? If you've got 12.5V static, may not ne the battery. Like Wirespokes says, check the battery voltage while trying to crank the bike (heavvvy load). If it starts, what is the system ("battery") voltage with the engine at or above 3000rpm? If the voltage is 13.5 to 14V, the alternator putout is good.

One item that is very good in general is an on-board voltmeter on the bike. It let you monitor the system voltage at all times and helps to prevent surprises. I like the Kuryayik LED bar-graph meter. A row of color LEDs, Green is good, Yellow is so-so, Red is bad. It's reliable and easy to mount and not expensive ($45-ish). http://www.kuryakyn.com/Products/872/LED-Battery-Gauge But there are others available.

I need to run into town ang get some eeelectrical goodies-- got an heated jacket liner the other day and I have to get it wired in. Be back later...

--Bill
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