Gearbox Earth Strap. 111-971-237A 111971237A £7.00 inc. VAT (where applicable) Quantity: at £7.00 each Add To Basket 0 in your basket View Basket Checkout 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.