Alsace_rangie Posted March 10, 2020 Share Posted March 10, 2020 97 Disco, 300TDI LHD. Some help needed please to understand what I should be seeing. No power getting to the wire on the glow plugs (0 volts) . Relay clicks on and off, light on the dash goes on and off. Relay/timer situated right behind the fuse box near the battery. It has 4 smaller black wires and 2 large , a Brown/Orange (N/O) and a Black Yellow (B/Y). I guess the B/Y is the feed to the plugs. The N/O has no power to it (0 volts), even with the key turned to the position where the plugs should operate. I am assuming this is the problem. Am I right that the N/O should be live? Any idea where it goes to? It disappears into a loom, and it's a hard plastic covered example. Is there a fuse somewhere? Any help or ideas appreciated. cheers Quote Link to comment Share on other sites More sharing options...
sierrafery Posted March 11, 2020 Share Posted March 11, 2020 (edited) 12 hours ago, Alsace_rangie said: Am I right that the N/O should be live? Any idea where it goes to? Yes it should be live, it goes to a fusible link described as being "P119 Fusible link - RH front of engine compartment behind battery" there is no clear view of it in the manual, it might be wrapped and not visible, better route a new wire to the relay's pin with a 60A inline fuse holder from the battery positive terminal Edited March 11, 2020 by sierrafery Quote Link to comment Share on other sites More sharing options...
Alsace_rangie Posted March 11, 2020 Author Share Posted March 11, 2020 Thanks. Is the NO line always live, i.e. not switched by the ignition key? But you are right, i can't see any in-line fuse. The wire goes into a loom enclosed in hard plastic flexible trunking, then branches. I one of the branches does head to the adjacent fuse box, but no easy way to trace the wire route without making a mess. So as suggested, take a live feed with 60A fuse. May try one of the waterproof trip/reset ones you can get. About the same price as a conventional waterproof inline fuse! Quote Link to comment Share on other sites More sharing options...
sierrafery Posted March 11, 2020 Share Posted March 11, 2020 The NO wire is connected directly to the battery through tha fusible link Quote Link to comment Share on other sites More sharing options...
Alsace_rangie Posted March 11, 2020 Author Share Posted March 11, 2020 The NO and YB wires have an exterior dia of about 6 mm, which would be 5.7 or 6 mm2 section . This is rated 42 or 50A. Sound about right? 60A is 8.5mm2 , a bit heavy to work with! Quote Link to comment Share on other sites More sharing options...
sierrafery Posted March 11, 2020 Share Posted March 11, 2020 You can work with a inline fuse holder which has wires too like this https://www.ebay.co.uk/itm/Maxi-Blade-Fuse-holder-splash-proof-waterproof-holder-free-fuse-8awg/281667851189?hash=item4194b653b5:m:mw2tqx9HUWfJF8L7Np5piqQ&var=580673049497 , the fuse is higher ampage than the wire gauge cos it's supposed to blow on a short to ground but for 300tdi glow plugs 40A fuse is enough Quote Link to comment Share on other sites More sharing options...
Alsace_rangie Posted March 12, 2020 Author Share Posted March 12, 2020 OK, assumed the 60A was a "last resort" level. Off to sort out some wire (5.7 or 6mm2) and an inline fuse . I'll probably expose as much of the existing NO wire (attached to the connector) as I can and cut/join that to the new fuse. Of course I'll put an insulated connector on the bit left sticking out of the harness/loom. It's dead right now but might spontaneously fix itself some day 🔥 By the time I get the bits and find time in the next few days, the weather will be warmer and I won't need the plugs, but it'll be ready for next winter 🙂 Quote Link to comment Share on other sites More sharing options...
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