Originally Posted by
martysmartie
The loom was sub standard to start with leave alone now! The main problem is the span of the switch, it brings the fans on to early then keeps them on for agaes, which causes the fuse to melt.
The problem only arises when stood still for a period in traffic etc if you don't have no fans, I am surprised it has never overheated as the temp rises rapidly when they are still, obviously when moving the fans are not required.
This is absolutely correct. The fans draw massive current that the fuse box and wiring wasn't really up to when new.
I suspect the harness is the same as the single fan standard Sierra system and wasn't really engineered to suit the Cosworths twin fan setup.
Rewiring them direct to the battery has one massive advantage on top of the fact the fans are now reliable, it pulls a lot of load out of the fusebox which stops the grim idle some cars have when the fans come on.
The YB fuse box really is massively overloaded on some cars.
You can find the looms in the
Cosworth section of our web shop here: