Cant figure out why right signal light flashes fast and left normal,also wired in electric guages to fuse box (previous owner put in aftermarket fuse block with new style fuses)when i turn signal lights on lights on guages faintly flash,also i had wire tester ( the kind with light to find power) had negative clip to negative post on battery with battery terminal removed and not touching anything, and when i touched pointer end of tester to any metal surface on truck got a faint light appeared,OK,now does fuse block have to be grounded,but its made of some hard plastic, not sure if it is grounded somewhere cause of all the wires coming out of it,,my thoughts is a bad ground somewhere,making signal lights act strange and guage lights flash when signals are on,and the tester light faintly lighting up when only grounded to battery post on battery and pointer touching metal or am i completing circut with tester?,,any help would be appreciated,,Thanks