The Sportster and Buell Motorcycle Forum - The XLFORUM®
 

Go Back   The Sportster and Buell Motorcycle Forum - The XLFORUM® > SPORTSTER MOTORCYCLE FORUM > Sportster Motorcycle Era Specific and Model Specific > Ironhead Sportster Motorcycle Talk (1957-1985)
XLF Blogs XLF Arcade XLF Disclaimer/Privacy Statement/Terms Of Use

Notices

Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

Active Threads
0 Iron 1966 XLRTT
Last Post: Steve9
Posted On: 17 Minutes Ago
Replies: 182
Views: 41,488
0 Ironhead Exhaust Poll
Last Post: Jeff
Posted On: 20 Minutes Ago
Replies: 213
Views: 60,844
0 yost power tube guy
Last Post: IronMick
Posted On: 29 Minutes Ago
Replies: 87
Views: 4,660
0 Hammer 1275 clang noise, slow oil feed, kinked crankcase vent.
Last Post: Tomcatt
Posted On: 30 Minutes Ago
Replies: 433
Views: 13,930
0 oil filter stuck
Last Post: mikethebike61
Posted On: 32 Minutes Ago
Replies: 11
Views: 330
0 Sidehack for XLS
Last Post: mikethebike61
Posted On: 42 Minutes Ago
Replies: 76
Views: 6,578
0 S&S Super B help
Last Post: RicThompson
Posted On: 54 Minutes Ago
Replies: 1
Views: 72
0 Why cafe a sportster?
Last Post: Steve9
Posted On: 59 Minutes Ago
Replies: 272
Views: 98,590
0 Swing arm bearing change
Last Post: SportsterXLCH1967
Posted On: 1 Hour Ago
Replies: 3
Views: 71
3 Wtb, Wts, Wtt, Wtg (Ironhead)
Last Post: Crusty
Posted On: 1 Hour Ago
Replies: 21
Views: 277,413
0 Lets see your off season builds
Last Post: Tinz
Posted On: 1 Hour Ago
Replies: 1,670
Views: 249,893
0 Changing stock air cleaner to aftermarket
Last Post: rocketmangb
Posted On: 1 Hour Ago
Replies: 1
Views: 50
0 Hottie of the day, no nudity.
Last Post: cal43
Posted On: 2 Hours Ago
Replies: 28,366
Views: 3,015,171
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: cal43
Posted On: 2 Hours Ago
Replies: 50,339
Views: 8,263,641
0 What to do now? Ironhead clutch hub nut stripped
Last Post: sungod
Posted On: 2 Hours Ago
Replies: 3
Views: 132
0 Homemade Lithium Battery
Last Post: t120r
Posted On: 3 Hours Ago
Replies: 21
Views: 510
0 RIP Trainman
Last Post: clif02
Posted On: 3 Hours Ago
Replies: 26
Views: 1,062
0 Bolts and Metal Type
Last Post: BigMek
Posted On: 4 Hours Ago
Replies: 3
Views: 202
0 Roads I'd like to ride.
Last Post: Stairman
Posted On: 4 Hours Ago
Replies: 3,467
Views: 365,387
0 Hot Rods, Rat Rods, and Customs.
Last Post: cal43
Posted On: 5 Hours Ago
Replies: 4,474
Views: 735,014
0 Hot Chicks on Hot Bikes
Last Post: cal43
Posted On: 5 Hours Ago
Replies: 11,886
Views: 2,525,016
0 Corona Virus
Last Post: rejeanprimeau
Posted On: 6 Hours Ago
Replies: 1,618
Views: 157,716
0 Keep & Kill
Last Post: Crusty
Posted On: 8 Hours Ago
Replies: 21,381
Views: 1,262,555
0 ....1
Last Post: Graywolf
Posted On: 8 Hours Ago
Replies: 6,031
Views: 357,549
0 Oil pressure stays up 20min after shut of
Last Post: juzyHD
Posted On: 9 Hours Ago
Replies: 5
Views: 168
0 S&S Super E
Last Post: Jeff
Posted On: 13 Hours Ago
Replies: 12
Views: 483
0 Do you blow dry your ride after wash
Last Post: Stairman
Posted On: 14 Hours Ago
Replies: 175
Views: 20,476
0 What’s your take on Harleys ceo putting down the sportster line
Last Post: Crusty
Posted On: 14 Hours Ago
Replies: 35
Views: 2,575
0 Magneto Sportster's 1964 XLH Restoration Project
Last Post: Tim The Grim
Posted On: 14 Hours Ago
Replies: 50
Views: 6,693
0 Mimi the Deerslayer: the triple threat
Last Post: thecarfarmer
Posted On: 14 Hours Ago
Replies: 42
Views: 3,551
More...
Members Birthdays
Reply
 
Share Thread Tools Display Modes
  #11  
Old 5th March 2021
VintageVinny VintageVinny is offline
Biker
 
Join Date: Feb 2021
Posts: 32
Sportster/Buell Model: 1974 Sportster
Sportster/Buell Year: 1974
Reputation: 10
VintageVinny is an unknown quantity at this point
Default

BigMek suggested that I check to see where I'm losing voltage, and here are the results:

Battery at 12.1 volts (a little low because I had been testing with it).
Red wire going into starter relay at 12.1 volts.
Green wire on starter relay at 10.1 volts (when starter is activated).
Green wire on solenoid at 9.8 volts (when starter is activated).
Short fat lug on the solenoid at .75 volts (when starter is activated).

So it looks like the problem is the solenoid, which puzzles me.
It's brand new and has no more than 10 starting attempts on it.

Smokey 2 - I believe the grounds are good, because I can jump the two fat solenoid posts and starter spins fine.
Reply With Quote
  #12  
Old 5th March 2021
Yellowstone Kelly's Avatar
Yellowstone Kelly Yellowstone Kelly is offline
Ironhead Rider
 
Join Date: Jun 2011
Location: Iowa
Posts: 1,057
Sportster/Buell Model: XLH 1000, Stock
Sportster/Buell Year: 1982
Sportster/Buell Model #2: XLH 900 Hardtail Chop
Sportster/Buell Year #2: 1969
Other Motorcycle Model: FLSTC
Other Motorcycle Year: 1996
Reputation: 285063
Yellowstone Kelly has a reputation beyond reputeYellowstone Kelly has a reputation beyond reputeYellowstone Kelly has a reputation beyond reputeYellowstone Kelly has a reputation beyond reputeYellowstone Kelly has a reputation beyond reputeYellowstone Kelly has a reputation beyond reputeYellowstone Kelly has a reputation beyond reputeYellowstone Kelly has a reputation beyond reputeYellowstone Kelly has a reputation beyond reputeYellowstone Kelly has a reputation beyond reputeYellowstone Kelly has a reputation beyond repute
Default

If all you're doing is shorting the two large terminals of the solenoid together, it's only the starter motor that's spinning, right? That doesn't take much electrical current.

The battery could still be weak or bad, because it takes a huge amount of current to spin the motorcycle motor over if the solenoid pulls the plunger in and the bendix is engaged to the ring gear on the clutch basket.

I'd fully charge the battery and try the test again and see what the numbers are.
__________________
-------------------------
"Never underestimate the power of human stupidity." Robert A. Heinlein

http://xlforum.net/forums/signaturepics/sigpic72446_4.gif
Reply With Quote
  #13  
Old 6th March 2021
flthd31 flthd31 is offline
Biker
 
Join Date: Dec 2016
Location: northwest PA
Posts: 56
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1971
Sportster/Buell Model #2: XLH
Sportster/Buell Year #2: 1983
Reputation: 55823
flthd31 is a splendid one to beholdflthd31 is a splendid one to beholdflthd31 is a splendid one to beholdflthd31 is a splendid one to beholdflthd31 is a splendid one to beholdflthd31 is a splendid one to beholdflthd31 is a splendid one to beholdflthd31 is a splendid one to beholdflthd31 is a splendid one to beholdflthd31 is a splendid one to beholdflthd31 is a splendid one to behold
Default

Quote:
Originally Posted by VintageVinny View Post
Battery at 12.1 volts (a little low because I had been testing with it).
I concur with Kelly.

Most good 12v batteries will read 12.7-12.8 volts at rest and anywhere between 12.5 and 13.5 volts are what you want. When volts drop to 12.4 your bike may not start. Fewer than 11.8 ...it's dead.

At 12.1 your battery is dying. Throw a charger on it. Can't hurt.
Reply With Quote
  #14  
Old 6th March 2021
72 Ironhead XLH's Avatar
72 Ironhead XLH 72 Ironhead XLH is offline
Senior Master Custom Bike Builder
 
Join Date: May 2005
Location: NJ
Posts: 5,960
Sportster/Buell Model: XLH
Sportster/Buell Year: 72
72 Ironhead XLH has disabled reputation
Default

Short fat lug on the solenoid at .75 volts (when starter is activated).
There the problem. activating the solenoid should show battery voltage on both large lugs.
If you physically short the 2 large lugs and the starter turns, your solenoid is not working correctly or you have dirty contacts inside the solenoid
Reply With Quote
  #15  
Old 6th March 2021
72 Ironhead XLH's Avatar
72 Ironhead XLH 72 Ironhead XLH is offline
Senior Master Custom Bike Builder
 
Join Date: May 2005
Location: NJ
Posts: 5,960
Sportster/Buell Model: XLH
Sportster/Buell Year: 72
72 Ironhead XLH has disabled reputation
Default

click to enlarge
Reply With Quote
  #16  
Old 6th March 2021
VintageVinny VintageVinny is offline
Biker
 
Join Date: Feb 2021
Posts: 32
Sportster/Buell Model: 1974 Sportster
Sportster/Buell Year: 1974
Reputation: 10
VintageVinny is an unknown quantity at this point
Default

Looks like it's a battery issue.

After a night on the trickle charge, battery voltage is 12.6 and on the solenoid (when activated) is 11 volts.

Two hours later, with no usage, the battery is down to 12.1 and voltage at the solenoid (when activated) is at 0.8 volts.

On Monday, I'll see about exchanging the battery. I bought it last month at local Batteries Plus. Thank you all for your help.
Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT +1. The time now is 17:14.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC