Complete Electrics Failure

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Station House

Well-Known Member
Posts
3,960
Location
Fife, Scotland
Hi Guys and hope you had a great Christmas.

Am seeking some advice which I can't solve with my grey matter or Haynes manual.

All electrics temporarily failed in my Defender 90 (1994) this morning.

Wonder if I overloaded the system, but no fuses blown (in behind gear lever location) and the 2 60 amp and 1 30 amp fuse in the engine bay (left of the heater) are OK too.

Had the dash out to replace speedo bulbs. Had reassembled and was gradually turning everything on to check all instrument bulbs worked (lights, mainbeam, indicators, glow plug etc etc).

Went to turn ignition key and a single 'click' sound and then all power went dead - not even the side lights would power up.

Click sounded more like an electrical trip than a solonoid working (similar to that which you sometimes hear in turning a domestic consumer unit MCB on whilst things are plugged in waiting to draw power).

After about 20 seconds power returned to side lights. It happened again on then trying to start. Checked every fuse with a multimeter. Now back working, but as left me puzzled and nervous of a repeat performance.

From the wiring diagram I can't see any overload protection device which cuts all power to every system and then automatically resets after a short while.

Is there such a thing, or something else that I've missed checking.

Many thanks for any ideas.
 
all brown wires are battery lives and on your 300 tdi first go to fuse block next to heater then to ignition switch there is no other overload device as standard it is easy to pull at brown battery feed on ignition switch when pulling about with dash panel
 
Many thanks for the reply

Could be a loose wire to the ignition switch, but not sure that would explain total power loss (non ignition switched as well as ignition controlled) and then 'self recovery'

I'll check the ignition switch just in case

Was hoping for a surge protector and therefore a 'non need to worry further' solution!
 
All fixed, and yes I feel stupid!

Having read so much about the earth issues, I checked the ultimate earth this morning.

Loose connector to battery terminal :doh:
 
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