- From the battery «c» See illustration on opposite page. - From the electrical fuel pump «d» - From the car chassis «d» Check the tightness of the bolts and pull gently on the leads to ensure that they are properly secured to their terminals. 2) Since it is difficult to check the contacts of the harness connections on the various injection system compo- it is necessary to carry out a test-run with a new wiring harness.