Truck will not start unless Jumped.

Asked by Sep 14, 2016 at 05:55 AM about the 1998 GMC Sierra 1500 C1500 SLE Extended Cab SB

Question type: Maintenance & Repair

This is a problem that has been driving me
up a wall, and I cannot for the life of me,
Figure it out. '98 GMC Sierra with the 305
5.0 stock motor. The truck will only start if I
have it hooked up to jumper cables, and it
gets a jump. Will run fine, but as soon as i
turn it off, and try to crank it again, without
the cables, its dead. Battery is brand new,
alternator passed tests, and starter is new
as well.

1 Answer

24,415

it could have bad connections from the battery to the starter which is draining current- that fuel injected engine needs a lot of battery power to get it to crank and fire- not like the old analog engines which would fire up even with a low battery- also, make SURE the battery and alternator are good- and that the starter is good and not drawing too much current- even brand new batteries have been known to have dead cells- good luck

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