McCormick mc135 electric fault.

[Kiwi4]

Help please I was driving down the road today and as I turned into the field I lost power in the cab for the pto, shuttle, air con etc. The tractor will still start but no movement. We found a mega fuse 100 watt was blown but didn't sort the problem when fixed, got the alternator checked also by auto electrician tonight. There is power at the large nut at the firewall leading into the cab. Will check the relays behind the dash in the morning, any other ideas would be appreciated. Thanks

 

[hintonroadhero]

Help please I was driving down the road today and as I turned into the field I lost power in the cab for the pto, shuttle, air con etc. The tractor will still start but no movement. We found a mega fuse 100 watt was blown but didn't sort the problem when fixed, got the alternator checked also by auto electrician tonight. There is power at the large nut at the firewall leading into the cab. Will check the relays behind the dash in the morning, any other ideas would be appreciated. Thanks

Pull that plug through the firewall apart....bet you find some of the pins are corroded...

 

[DRC]

I was having a similar problem on my NH T7200. Eventually found a wire rubbing through that went to the PTO sensor . It was shorting out and blowing the fuse

 

[avag]

There’s a 70amp relay behind the dash that’s common to fail and lose power to cab

 

[Kiwi4]

I checked the pins on plug at firewall this morning and they are all shiny and look perfect. When I tested the alternator,I could get 12 volts going in but it was only showing 0.03 at the W even though the regulator was replaced last night. Will contact electrician first thing again.

 

[Kiwi4]

Hi folks, thanks for all the suggestions and advice. We found the problem was that the previous owner had replaced the 70 amp relay in the dash with a 50 amp at some stage, and will all the power been drawn it melted.

 

[Kiwi4]

There’s a 70amp relay behind the dash that’s common to fail and lose power to cab

That was the problem thanks.