MG-Cars.net

Welcome to our resource for MG Car Information.

Recommendations

Parts

MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG MGB Technical - prince of darkness

Hi all, a friend of mine with a '75 B all of sudden lost operation of gas gauge, tach, brake lights and turn signals. He has checked grounds from stem to stern and found no problems. Is there a common wire under the dash that connects these instruments? Thanks in advance.
Keith Yarbrough(TD 1275)

He might want to start by checking at the fusebox to see if there's 12v coming in on the white and out on the green.
Dave O'Neill 2

All those circuits are ignition live, green wire circuits which are fed by the ignition white circuit direct from the ignition switch. If the ignition feed had gone down he would also have lost the fuel pump and ignition.
Next to the bottom fuse. Check the fuse and clean the spring fuse holders and the male spades
. He'll find the reversing lights inoperable too.
17 amp continuous, 35 amp blow were the fitted fuses.
Allan Reeling

This thread was discussed between 23/02/2021 and 24/02/2021

MG MGB Technical index

This thread is from the archive. The Live MG MGB Technical BBS is active now.