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Spartasotan
New User
Apr 27, 2011, 11:38 AM
Post #1 of 6
(1872 views)
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94 Suburban won't start
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1994
Chevy
Suburban
5.7
150,000 miles
Every time I want to use it (not often) it needs to be jumped. Battery tests good and is new. Once jumped I removed positive battery cable and continues to idle fine. Drove for 20+ minutes and park; try to start and it just won't.
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 27, 2011, 11:50 AM
Post #2 of 6
(1866 views)
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Re: 94 Suburban won't start
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First off, don't ever remove a battery cable with the engine running. You can take out every computer in the car in a heartbeat..
You may have a parasitic draw.
There is a procedure for finding a battery draw like that.
You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 10 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Spartasotan
New User
Apr 27, 2011, 12:57 PM
Post #3 of 6
(1857 views)
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Re: 94 Suburban won't start
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Hmmm. My rear hatch window does not latch anymore; it is the old style where it lifts up. Could that possibly be drawing? I don't have an ammeter on hand and just seems like problem has been since window has been effed?
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 27, 2011, 12:59 PM
Post #4 of 6
(1855 views)
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Re: 94 Suburban won't start
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That would probably cause interior lights to stay on. You're not going to know unless you run the tests.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Spartasotan
New User
Apr 27, 2011, 1:02 PM
Post #5 of 6
(1851 views)
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Re: 94 Suburban won't start
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What if I pull the fuse, jump it and see if it restarts? The fuse cuts the circuit, right?
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 27, 2011, 1:04 PM
Post #6 of 6
(1848 views)
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Re: 94 Suburban won't start
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You're not going to know what fuse is powering the draw or even if you have a draw unless you run the tests.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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