Truck problems

Asked by Sep 30, 2017 at 09:33 PM

Question type: Maintenance & Repair

My 1999 gmc yukon wont start! I recently had my
alternator and fuel pump replaced and my battery
was tested and waz told it was good! But if I let my
truck sit for a few hours without going out to crank
it up it won't start but it will turn over but just won't
start and have to keep gettn jumps just to get it
started! I also have to keep going out every few
hours to start it and let it run for bout an hour or so
please help me figure out what the problem is
because it's driving me crazy

19 Answers


Parasitic drain

1 people found this helpful.

sounds like who ever did the work is responsible , but yeah , somethings draining the batt.

Guru9FSV8 what is that and how can I check it and is that something mechanics kno about


YouTube it and you can see a video about it. There are plenty on this subject. It is when a circuit is pulling on your battery when it should either be asleep or pulling very minimal miliamps. You have either a module staying active or a short or a switch that is not going off with ignition. A bad relay can cause these also. Watch a few videos and you will get the idea.


Yes all mechanics know about this issue. It is very common in the industry.

Thanx so much for ur help I really appreciate it


You have a high amp draw for it to only last a few hours. Do you have an aftermarket radio? From my experience, radios are the number 1 cause of parasitic drains.

Yes it's an aftermarket radio


I would almost put money down that if you pulled your radio fuse that you would find your issue. Strictly my opinion. :)

U have been very helpful and I'm gunna mention it too da mechanic because he did tell me it waz sumthin electrical that's wrng with it! But I really do thank u for taking da time to help me


For the short term. Disconnect your Negative battery terminal to keep battery from draining until you can drive it to mechanic

Will do! Thanx


Tested by who? May be a bad cell in that battery. Disconnect it and go back a few hours later or next day and if it cranks up fine then parasitic drain, if not bad battery.


If battery was taken off before it drained too low also. If it doesn't start does not necessarily mean it is a bad battery for the reason I gave. If she had just run vehicle and charged it up and then taken it offline and it doesn't start, then the possibility of the battery being bad is greater.

Engine creator: it waz tested by the mechanic and auto part store and both said it waz a gud battery! Guru9FSV8: I took the negative cable off like u state before and when I came out to go to wrk I hooked it bac up and it started bac up with no problem, thanx alot


Yeah, I feel very confident that it is a parasitic drain.

Once again I appreciate your help! Thanx alot


Test main circuits to see which circuit is draining with a multimeter tool to narrow down. Youtube does have a lot of these test shown , not all test should be performed on all cars/trucks depending on year and computer configuration. Good luck.


I believe she said she is handing the issue over to her mechanic. She is going in knowing what it is. :)

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