Gearbox Earth Strap. 111-971-237A 111971237A Was £7.00 - Now £6.30! inc. VAT (where applicable) Quantity: at £6.30 each Add To Basket Gearbox earth strap. This is a common cause for poor, or temperamental starting. The strap breaks down and causes a bad earth for the starter motor. Top quality product, correct for Splitscreen and Bay window buses.