Question about 1999 Chevrolet K1500

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I have a 99 suburban and on occassion i goto start vehicle and ignition has no power i pop the hood pull out the starter relay pop it back in and the vehicle starts ive done this on numerous occassion and it works everytime whats goin on please help

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OK in some cases the pins get dirty or corroded and pulling the relay in and out cleans the contacts. However I think that since you have had to do this a few times it might be worth while just taking a closer look at the relay. Remove the relay and remove the casing. Two things can happen to upset a relay a) the electrical contacts can become oxidised with the clicking/sparking as the current circuit is tripped - to fix this just insert a folded strip of sandpaper between the contacts to freshen up the metal contacts. b)((this is what I guess is happening to yours) check the circuit board and look at for dry solder joints or cracking around a particular pin. Anything like this just flux and resolder. A cracked joint can break a connection when the engine bay is hot (thermal expansion of the board) or just due to vibration. Good that you cornered the fault to the relay. Just fix the relay and I think your troubles are over, in this respect at least

Posted on Aug 29, 2010

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2000 JIMMY 4.3 WONT START AND KEEP BLOWING MAIN 40AMP FUSESE


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Which fuse ? IGN A - 40 amp ,under hood fuse / relay box ? This fuse powers the Starter Relay and Ignition and Start Switch
Does your vehicle have a manual or automatic transmission ? The starter relay could be shorted inside , It's also located in the under hood fuse box . If you pull the relay out of the box it's plugged into an look on the bottom of it you would see four sets of numbers ! 30 & 87 an 85 & 86 . If you were to jump 30 to 87 in the relay box the starter should spin the engine over , not start an run just spin ! 85 & 86 is the control side . Could be the ignition switch !
That 40amp fuse powers a lot of subsystems !

Here is a web site for free diagrams !
http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine , Under system click on electrical distribution , under sub system click on power distribution . Then click the search button .Click blue links one at a time . First blue link scroll down to the second diagram . You will see Ign A 40 amp fuse at the top of the page .you will also see it powers the igintion switch ,look at last part of ignition switch , when in start or run that 40 amp fuse powers all those other fuse's plus three relays i see there also . A/C compressor relay , rear window defroster relay ,daytime running lights . Any one of those circuits could have your short . You need to isolate the circuits , pull fuse's till the fuse doesn't blow !

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( one question i have is every time the ignition fuse blows do i need to replace the starter relay? ) NO ! You have a dead short to ground on one of the circuits that fuse feeds. Do you know how to find a short circuit ? Video's on youtube show how. The fuse that blows ,is it IGN - A 40 amp. located in the under hood fuse/ relay center ? That fuse feeds B+ voltage to the ignition switch ,which powers up other thing's ,fuse's etc.. Not just the starter relay ! I see five other fuse's that get power from that fuse when ignition switch is in the start or run position . In the I/P fuse panel the gauges fuse #4 10amp , air bag fuse #10 10amp , turn b/u fuse #16 20amp. , Plus trans fuse #20 10 amp ! Pull out these fuse an try to start the van. if the ignition fuse doesn't blow the problem is in one of these other fuse circuits. There is one more fuse that get's B+ power from the ignition switch and ign A fuse ,crank fuse fuse #8 10amp. this powers the control side of the starter relay .
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