Ignition short help

Talk about the E-Type Series 2

Topic author
AnD3rew
Posts: 48
Joined: Sun Jul 30, 2017 10:31 pm
Australia

#1 Ignition short help

Post by AnD3rew » Sun Jan 26, 2020 5:56 am

Hi there

I have a short somewhere between the coil positive terminal and the ignition fuse behind the dashboard. The car cut out going over a speed bump at low speed. There was no power at the coil positive terminal. I found a blown fuse behind the dash and replaced it and checked the circuit and it was active again I started the car and it ran for about a minute and blew again.

Any advice on where to look first would be much appreciated, I am suspicions that there may be a worn wire somewhere and when the body flexed over the speed bump it moved and shorted.
Sydney Australia

Current
Jaguar Red Series 2 2+2 XKE 1969
Jaguar Italian Racing Red F-Type S 2014
Jaguar XJ6 Vanden Plas dark green 1985
Jaguar XJS V12 Silver 1987


Previous of interest
Jaguar XJ6 Sovereign series 3
MGA 1959

Link:
BBcode:
HTML:
Hide post links
Show post links


cactusman
Posts: 2170
Joined: Wed Nov 14, 2012 11:09 pm
Location: Hertfordshire
Great Britain

#2 Re: Ignition short help

Post by cactusman » Sun Jan 26, 2020 8:11 am

Hmmm....the feed.to the ignition is not actually fused according to the standard diagram as the white wire is connected to the ignition switched permanent live side of fuse 6 and seven....there are several white wires all connecting here...white is by convention ignition live but not fused.

Presumably someone has possibly moved your ignition feed to the other side of the fuse where there will be lots of green wires.....green is ignition live but now fuse protected.

So it may well be that another circuit fed from which ever fuse is now feeding your ignition has an issue.

Alternatively someone may have fitted a specific fuse just for your ignition....the coil feed white wire goes via the tachometer and through the main front loom to the coil so lol at the wires behind the tachometer and then follow the main engine loom ...it runs down the lhs footwell, through a big grommet into the engine compartment and then around the frames....look for damage....
Julian the E-type man
1962 FHC
1966 MGB....fab little car too

Link:
BBcode:
HTML:
Hide post links
Show post links


Topic author
AnD3rew
Posts: 48
Joined: Sun Jul 30, 2017 10:31 pm
Australia

#3 Re: Ignition short help

Post by AnD3rew » Sun Jan 26, 2020 9:59 am

Hah, thanks, now I am very confused. Will try to follow it through.
Sydney Australia

Current
Jaguar Red Series 2 2+2 XKE 1969
Jaguar Italian Racing Red F-Type S 2014
Jaguar XJ6 Vanden Plas dark green 1985
Jaguar XJS V12 Silver 1987


Previous of interest
Jaguar XJ6 Sovereign series 3
MGA 1959

Link:
BBcode:
HTML:
Hide post links
Show post links

User avatar

ralphr1780
Posts: 997
Joined: Wed Apr 11, 2012 4:29 pm
Belgium

#4 Re: Ignition short help

Post by ralphr1780 » Sun Jan 26, 2020 10:57 am

Check the ground strap body-engine is making good contact, this might be the origin of your issue.
Ralph
'69 OTS + '62 OTS - Belgium

Link:
BBcode:
HTML:
Hide post links
Show post links

User avatar

abowie
Posts: 3060
Joined: Wed Sep 07, 2011 9:15 pm
Location: Australia
Contact:
Australia

#5 Re: Ignition short help

Post by abowie » Sun Jan 26, 2020 11:03 pm

ralphr1780 wrote:
Sun Jan 26, 2020 10:57 am
Check the ground strap body-engine is making good contact, this might be the origin of your issue.
This is very sensible advice.
Andrew.
881824, 1E21538. 889457..oops. Jezza the V12 XJS race car.
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia

Link:
BBcode:
HTML:
Hide post links
Show post links


Topic author
AnD3rew
Posts: 48
Joined: Sun Jul 30, 2017 10:31 pm
Australia

#6 Re: Ignition short help

Post by AnD3rew » Mon Jan 27, 2020 10:22 am

Have narrowed it down a bit, the fuse that keeps blowing is the one for the tail lights and horn, the fuse is getting too hot to touch and then blows, and even when the fuse is intact the tail lights aren’t working. It also isn’t exciting the diodes to get the alternator working.

I can’t currently get in to check the earth strap, I can’t see it from above and my jack won’t get the car high enough to get far enough under to check it properly. Have checked what I can see of the brake light wiring and can’t seem to find any wearing or broken wires. But can’t see all of it.
Sydney Australia

Current
Jaguar Red Series 2 2+2 XKE 1969
Jaguar Italian Racing Red F-Type S 2014
Jaguar XJ6 Vanden Plas dark green 1985
Jaguar XJS V12 Silver 1987


Previous of interest
Jaguar XJ6 Sovereign series 3
MGA 1959

Link:
BBcode:
HTML:
Hide post links
Show post links

User avatar

mgcjag
Moderator
Posts: 6045
Joined: Fri Jul 09, 2010 6:15 pm
Location: Ludlow Shropshire
Great Britain

#7 Re: Ignition short help

Post by mgcjag » Mon Jan 27, 2020 10:28 am

Hi........you could use a multimeter to check continuity and resistance from battery neg to body.....fuse 5 should be for front/rear tail lamps and panel lamps and heated rear windscrean..fuse 3 & 6 for the horn...what model E are we looking at...your 69 S2 2+2..you could narrow things down by removeing all fuses.....get the car running then fitting one fuse at a time till problem....reoccours..Steve
Steve
1969 S2 2+2 & Building a C type replica

Link:
BBcode:
HTML:
Hide post links
Show post links

User avatar

PeterCrespin
Posts: 4437
Joined: Fri Mar 05, 2010 8:22 pm
Location: Gaithersburg, Maryland.
Contact:
United States of America

#8 Re: Ignition short help

Post by PeterCrespin » Mon Jan 27, 2020 7:25 pm

Just clamp a jump lead from battery earth post to a head nut.
1E75339 UberLynx D-Type; 1R27190 70 FHC; 1E78478; 2001 Vanden Plas

Link:
BBcode:
HTML:
Hide post links
Show post links

Post Reply Previous topicNext topic