Help!... 3CX wiring nightmare.

[Al_1977]

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Evening all,

Need some advise pls, this looks like a right nightmare.

I wanted to get the old beast out to do a bit of graft this morning, she's not been started for a while so with a fully charged battery, turned the ignition to pre-heat for approx. 25seconds - then tried to crank her, I heard the starter motor engage; but no cranking. When I tried turning the key again, I could hear a relay (or something) activating behind the side-dash, but no main dash (pre-ignition) warning light, no starter motor engage.

First port of call was the fuses on the battery terminal, which all buzzed out for continuity on the multimeter... then checked the blade fuses in the side dash, no issues there.

As all appeared to die after the pre-warm, we were drawn back to the battery box to double check that fuse block... and when the terminal was removed - all became clear. There was no heat in the plastic so this was the startup that was obviously the final straw of something that had been brewing since before I bought it (this was the first time I'd taken the battery off to charge it).

It's a 1999 project 12... thoughts on best way to repair?

 

[V8Druid]

[/url]

Evening all,

Need some advise pls, this looks like a right nightmare.

I wanted to get the old beast out to do a bit of graft this morning, she's not been started for a while so with a fully charged battery, turned the ignition to pre-heat for approx. 25seconds - then tried to crank her, I heard the starter motor engage; but no cranking. When I tried turning the key again, I could hear a relay (or something) activating behind the side-dash, but no main dash (pre-ignition) warning light, no starter motor engage.

First port of call was the fuses on the battery terminal, which all buzzed out for continuity on the multimeter... then checked the blade fuses in the side dash, no issues there.

As all appeared to die after the pre-warm, we were drawn back to the battery box to double check that fuse block... and when the terminal was removed - all became clear. There was no heat in the plastic so this was the startup that was obviously the final straw of something that had been brewing since before I bought it (this was the first time I'd taken the battery off to charge it).

It's a 1999 project 12... thoughts on best way to repair?

for starters (excuse the pun) I'd do my best to determine which wires went where, whilst there're a few strands attached still - assume that's a relay box?? assuming that is a relay box, fit suitable spades to the wire ends and try a new box ?

 

[Gecko]

As above - identify everything it's doing.
Each wire has a number printed on it that you can lookup in the manual to find its function

Looking at the manual, I'd guess this it the lump you are holding?

While it would be nice to keep the fuse layout original (for future trouble shooting) - if it's just 4x fuses, an aftermarket box would do.

 

[V8Druid]

As above - identify everything it's doing.
Each wire has a number printed on it that you can lookup in the manual to find its function

View attachment 77014

Looking at the manual, I'd guess this it the lump you are holding?

View attachment 77015

While it would be nice to keep the fuse layout original (for future trouble shooting) - if it's just 4x fuses, an aftermarket box would do.

weird set up

 

[Al_1977]

Yes bunch of fuses on the battery positive terminal, pretty heavy duty... will it be ok to use spade connectors to 50a fuse?

I'll try a dealer tomorrow... but I suspect even if block is available for an old machine - getting the plug connector which isn't on a loom could be tricky.

 

[Gecko]

You'd need the big 3/8" (10mm) spade terminals and you certainly wouldn't want to rely on the cheap 'dimple' crimp tool.

Looks like the fusebox is common across many models and should be widely available
JCB seem to be in the process of pimping their website again, so naturally you can't see any parts

Fuse Box 717/14600 for JCB 3CX, 4CX | 5-Way, OEM

High-quality OEM fuse box 717/14600 for JCB 3CX, 4CX, Loadall machines. Replaces 717/11000. Restore your machine's electrics. Order now!

serwis-kop.pl

 

[Al_1977]

You'd need the big 3/8" (10mm) spade terminals and you certainly wouldn't want to rely on the cheap 'dimple' crimp tool.

Looks like the fusebox is common across many models and should be widely available
JCB seem to be in the process of pimping their website again, so naturally you can't see any parts

Fuse Box 717/14600 for JCB 3CX, 4CX | 5-Way, OEM

High-quality OEM fuse box 717/14600 for JCB 3CX, 4CX, Loadall machines. Replaces 717/11000. Restore your machine's electrics. Order now!

serwis-kop.pl

Much appreciated sir.

 

[V8Druid]

what a totally crap idea

 

[Gecko]

what a totally crap idea

Probably better than running heavy cables into the cab and back out again (to the regular fuse box).
Mounting it off the battery certainly exposes the wires/contacts to any acid fumes, but I think the failure mode of this one is a poorly supported cable bundle.