1995 JCB 530-120

[Gareth S]

Hi,
I was working in the machine today and hit the fan button to clear the window. Once I did this the machine stopped. There is now no power going to the dash when I turn the ignition key. When I hit the hazard lights and lights they work but no power when key is turned. I’ve checked the fuses in the dash but they are all fine. Anyone any ideas or could point me in the right direction? Thanks

 

[v8willy]

Could be a relay or any number of things, but I'd have a look at the ignition switch.

 

[Gareth S]

Could be a relay or any number of things, but I'd have a look at the ignition switch.

That’s the problem. I took the cover off the top of the ignition switch but it’s spaghetti junction ?! There are a number of relays in there but it’s finding the faulty one if that is the case

 

[Gareth S]

Just wondered had anyone came across similar

 

[startinghandle]

Could it be a bad earth connection on the battery or somewhere else???

 

[Gareth S]

Would a bad earth still leave power on the dash for the lights and hazards? I’m gonna try starting at the battery and heading back with the voltmeter to see where the power ends. If anyone has anything other ideas I’d appreciate the heads up.

 

[TripleSix]

Have you checked all fuses?

Some jcbs have some big fuses by the battery etc

 

[Gareth S]

Have you checked all fuses?

Some jcbs have some big fuses by the battery etc

There doesn’t appear to be an near the battery that I can see?

 

[traineefarmer]

They will be close to the battery somewhere. Big maxi fuses in a holder.

 

[Gareth S]

What sort of amp of a fuse?

 

[Sparkplug]

Your machine may be too old for the fuses by the battery - but if it does have them you can not miss them - above positive terminal in a block.

 

[Gareth S]

Your machine may be too old for the fuses by the battery - but if it does have them you can not miss them - above positive terminal in a block.

yes it must be too old none around the battery.

 

[ACEngineering]

It'll be a old school 535-120 with engine under the boom I expect.

Battery connections
Main power feeds of starter motor which will go to cab

Also a bunch of multi pin plugs in the front outside of cab behind panel if its model I think it is.

 

[ACEngineering]

yes it must be too old none around the battery.

See above.

 

[Gareth S]

It'll be a old school 535-120 with engine under the boom I expect.

Battery connections
Main power feeds of starter motor which will go to cab

Also a bunch of multi pin plugs in the front outside of cab behind panel if its model I think it is.

Correct engine under the boom. Your right with battery and there is a panel at the front of the cab where pin plugs are on the outside behind a panel. Any ideas?

 

[startinghandle]

This may sound silly but anything is possible
Could the battery have failed??

 

[Gareth S]

The battery wasn’t a great one. I’m gonna get a lend of one and stick it in and if that doesn’t work then it’s something else

 

[Gareth S]

This may sound silly but anything is possible
Could the battery have failed??

If the machine was already started and running away surely by switching the fan on wouldn’t of caused it to go faulty tho? Once I Turned the switch it cut out straight away

 

[startinghandle]

As you say doubtful it is battery but if I have something with electric problems
I always check easy things first
Also look for relay with burnt casing also same with connections and cable that could have rubbed against something

 

[Sparkplug]

Seems strange that switching heater fan on could cause such a failure - you would expect it to blow Fan Fuse if it was seized, - where in the country are you?