Bough a used truck - voltage loss?

[TheJuggla1 10+ year member]

I bought this truck and the voltage drops a good .5-1 volts when I turn my turn signal on(jumps back and forth with turn signal), and maybe 1-1.5 volts when the head lights are on(Maybe weak alternator?), it stays steady at 14 with the head lights/turn signal turned off. The voltage loss from the turn signal happens wiether it is running or shut off, what is wrong with it? Just a loose ground somewhere or something?

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[dappa5 10+ year member]

chasis ground check that first then move on to engine ground

 

[TheJuggla1 10+ year member]

That is what should be causing the problem or could it be something else?

 

[I Like Waffle]

Thats not normal? I lose about .2 volts with the brights on, maybe its just the draw from the lights. However 1 whole volt does seem excessive.

 

[jdawg 5,000+ posts]

what truck? what engine? how old? you just looking at the inaccurate dash gauge?

 

[TheJuggla1 10+ year member]

Thats not normal? I lose about .2 volts with the brights on, maybe its just the draw from the lights. However 1 whole volt does seem excessive.

Ya you are not really loosing volts the lights use a lot of power so its common that it should drop down a little, not with a turn signal though I don't think that is suppose to happen ever.

The truck is a 94 Suburban w/ 350 In it

 

[DammitJames 10+ year member]

are you going by the dash gauge? check it with a dmm those dash gauges might as well be telling u how much boost ur 350 is runnin