Ausmini
It is currently Fri Jul 25, 2025 9:26 am

All times are UTC + 10 hours




Post new topic Reply to topic  [ 7 posts ] 
Author Message
PostPosted: Mon Dec 12, 2016 4:08 pm 
Offline
1098cc
1098cc
User avatar

Joined: Wed Aug 06, 2008 10:14 am
Posts: 1370
Location: Sydney
Well.....

After checking compression to see if my head gasket was causing cooling issues, my horn power wire magically disconnected itself and dropped onto the starter solenoid and shorted after I had reconnected the battery...

Also heard a sparking sound when put lead back onto coil.

The ignition light came on and then click when I went to start, then all dead as a dodo - no ignition light or anything.

Checked power is fine from battery to solenoid, but even using push-button, nothing happening when trying to start. Also no 12v feed out from solenoid to white/red wire to ignition switch....removed ignition switch and tested with multimeter -seems fine.

When testing continuity (battery disconnected) between power in terminal and power out terminal to starter on solenoid, there is continuity when the solenoid button is pressed.

Any ideas on what to check next? Fuses were fine and power feed to continuous power fuses is fine....

Thanks for any ideas.....

_________________
Cooper S Mk2
Cooper S Mk1
ex Cooper S Mk2, various Morris 1100s, 1300s, 1500s, Leyland Sherpa!


Top
 Profile  
 
PostPosted: Mon Dec 12, 2016 5:45 pm 
Offline
848cc
848cc

Joined: Thu May 14, 2015 9:57 pm
Posts: 169
Location: SE Melbourne
Check battery under load. May have 12V without load but as soon as you stress it, the voltage disappears. Dont ask me how I know :oops:

_________________
'78 1275 LS (Under Repair, Dependant #1's car)
'72 GT Powered Clubman (Mine)... Under (re) construction


Top
 Profile  
 
PostPosted: Mon Dec 12, 2016 6:21 pm 
Offline
1098cc
1098cc
User avatar

Joined: Wed Aug 06, 2008 10:14 am
Posts: 1370
Location: Sydney
Thanks,

Good tip. I have the battery on a charger now as I would have used a lot of juice cranking it for the compression test.

Will leave overnight and check tomorrow. Maybe I fried something at the same time.... :(

_________________
Cooper S Mk2
Cooper S Mk1
ex Cooper S Mk2, various Morris 1100s, 1300s, 1500s, Leyland Sherpa!


Top
 Profile  
 
PostPosted: Tue Dec 13, 2016 11:20 am 
Offline
1275cc
1275cc

Joined: Sat Feb 09, 2013 5:44 pm
Posts: 2236
Location: Camden
BBY755 wrote:
Well.....

After checking compression to see if my head gasket was causing cooling issues, my horn power wire magically disconnected itself and dropped onto the starter solenoid and shorted after I had reconnected the battery...

Also heard a sparking sound when put lead back onto coil.

The ignition light came on and then click when I went to start, then all dead as a dodo - no ignition light or anything.

Checked power is fine from battery to solenoid, but even using push-button, nothing happening when trying to start. Also no 12v feed out from solenoid to white/red wire to ignition switch....removed ignition switch and tested with multimeter -seems fine.

When testing continuity (battery disconnected) between power in terminal and power out terminal to starter on solenoid, there is continuity when the solenoid button is pressed.

Any ideas on what to check next? Fuses were fine and power feed to continuous power fuses is fine....

Thanks for any ideas.....


Tend to agree with 78Clubbie - clicking instead of whirring can be a poor connection at battery, earth, the solenoid or anywhere in between.

Your original "accident" should have shorted between horn power from fuse 2 which is fed by battery power at fuse 1 - usually blowing the fuse between 1 and 2. If there wasn't enough power to blow that fuse, contacts along the way might have only just been coping up to the accident.
Also - do you realise the White/red wire at Ign. Sw. only feeds to solenoid when switch is turned to spring-loaded 'start' position. (Don't mean to be rude... but you mentioned both 12v feed (battery power) and continuity (ohm meter) so I am not sure which one you mean).
The coil should be ok as it is supplied by the Ign Sw.
The horn lead terminals were originally insulated - maybe 'for just such an occasion'.


Top
 Profile  
 
PostPosted: Tue Dec 13, 2016 11:33 am 
Offline
1098cc
1098cc
User avatar

Joined: Wed Aug 06, 2008 10:14 am
Posts: 1370
Location: Sydney
Thanks Bill B,

I wasn't clear on the white/red ....will test everything with a full battery when I get a chance. Will update findings as they happen just in case someone does the same stupid thing I did! (Have a new terminal rubber boot in the garage that I hadn't fitted..... :oops: )

_________________
Cooper S Mk2
Cooper S Mk1
ex Cooper S Mk2, various Morris 1100s, 1300s, 1500s, Leyland Sherpa!


Top
 Profile  
 
PostPosted: Wed Dec 14, 2016 7:50 pm 
Offline
1098cc
1098cc
User avatar

Joined: Wed Aug 06, 2008 10:14 am
Posts: 1370
Location: Sydney
78Clubbie wins the kewpie doll!

Voltage showing 12-13 volts where should have been but when disconnecting isolator switch on earth battery terminal, checked negative terminal (positive earth Cooper S) which was SLIGHTLY loose.....

Put key in and generator light on, and it started first kick......knew it was something simple but not THAT simple....... :D :evil:

_________________
Cooper S Mk2
Cooper S Mk1
ex Cooper S Mk2, various Morris 1100s, 1300s, 1500s, Leyland Sherpa!


Top
 Profile  
 
PostPosted: Thu Dec 15, 2016 9:18 am 
Offline
religious status
religious status
User avatar

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39756
Location: near Baulkham Hills, NSW
Those cheap green battery earth isolator switches are only rated at 100A or so. It pays to check they are tight and clean them occasionally.
Mini's Lucas starter pulls a couple of hundred amps. [A Gemini one is rated at 350A...! According to their spec sheet].

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 7 posts ] 

All times are UTC + 10 hours


Who is online

Users browsing this forum: No registered users and 109 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  

© 2016 Ausmini. All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.