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Chevrolet Repair/454 crate motor problem

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Question
The beast
The beast  
My 1992 gmc Sierra custom has a 454 crate motor that's lifted on 40's. in other words, it's a bit of a beast. My husband was driving it back from the store one day and he stalled out going down a hill. It just seemed to die. That's makes me think its an alternator / electrical shortage problem. I'm not sure. I wasn't in the truck. Then he tells me that the it's overheating -temp maxed out. Them the battery dies. Mr. Know itall goes to AA and gets another thermostat. But doesn't realize he has gotten the thermostat for the stock engine in the truck. Genius, I know. I got into my other truck (diesel) and towed him all the way home without brakes and bla bla bla. I want my truck fixed but I don't want to get swindled when bringing it to a garage (I'm a chick) so I was looking for some advice before I do that. I've already got the battery recharged and there was some corrosion on the battery and connections. It also has a system. Any ideas? Thoughts? At least so I am prepared when going to a shop.

Answer
HI KATE,, THAT IS A BEAST !!!! YOU SAY IT HAS A SYSTEM, I WILL ASSUME YOU MEAN ALARM SYSTEM..I AM GOING WITH THAT..WELL THIS IS STRANGE,OVERHEATING AND ELECTRICALLY DEAD...IF A CUSTOMER CAME INTO OUR SHOP AND TOLD ME THIS I WOULD THINK THE ALTERNATOR BELT FELL OFF..THIS DRIVES THE WATER PUMP AS WELL. SO OVERHEATING,YES AND NO CHARGE...BUT I AM SURE YOU CHECKED THE BELTS TO MAKE SURE THEY ARE OK..SO IT IS POSSIBLE THAT YOU HAVE TWO SEPARATE PROBLEMS HERE...I WOULD HAVE THIS COOLING SYSTEM PRESSURE TESTED TO CK FOR ANY LEAKS..CORRECT IF YOU FIND ANY OF COURSE...IF NO LEAKS FOUND I WOULD GET THE CORRECT T-STAT FOR THIS BIG RAT 454 MOTOR AND INSTALL IT AND SEE HOW THIS GOES....I WILL ALSO ASSUME THE FAN IS WORKING OKAY,ALSO THE FAN BLADE IS 1/2 INCH INSIDE AND 1/2 INCH OUTSIDE THE SHROUD...THIS IS IMPORTANT FOR PROPER COOLING..SO IF ALL THIS IS OK AND YOU PUT A NEW STAT IN THEN LETS HOPE FOR THE BEST. ALSO MAKE SURE YOU ARE USING A 50-50 ANTI- FREEZE AND WATER MIX..IF IT STILL OVERHEATS THIS MAY HAVE PROBLEMS WITH BAD HEADGASKETS..BUT LETS NOT GO DOWN THIS ROAD TILL YOU MAKE SURE ALL OF THE ABOVE ARE OK...NOW AS FOR THE NO CHARGING PROBLEM,,HAVE YOU CHECKED FOR POWER ON THE BIG WIRE GOING TO THE BACK SIDE OF THE ALTERNATOR..SHOULD HAVE 12 VOLTS HERE,IF NOT TRACE THIS WIRE FROM EITHER THE BATTERY OR STARTER FOR A FAULTY CONNECTION OR BREAK IN THE WIRE..REPAIR IT AND IF YOU HAVE A VOLT METER HOOK IT UP TO THE BATTERY AND START HER UP.[IT IS A HER CORRECT]YOU WANT TO HAVE 13.8 VOLTS TO 14.5 VOLTS RUNNING WITH THE LIGHTS ON AND RPM'S AROUND 1200..IF NOT CHARGING TO THESE SPECS I WOULD REPLACE THE ALTERNATOR. I WOULD SUSPECT THE ALTERNATOR IS NOT CHARGING..[[YOU COULD REPLACE THIS YOUR SELF AND SAVE YOURSELF SOME $$$]] THIS WOULD CAUSE IT TO DIE WHILE RUNNING..SO LET ME KNOW HOW THE BEAST DOES AND GET BACK TO ME IF YOU NEED TO,,,GOOD LUCK TOM..

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TOM SHEETS

Expertise

PLEASE READ ALL OF THIS BEFORE ASKING ANY QUESTIONS. IF THIS CHEVY SECTION IS MAXED OUT.YOU CAN REACH ME IN THE OLDS/BUICK SECTION. Will answer questions from 6:00am to 10:00pm all days [EST][[[ NO DIESEL OR PAINT QUESTIONS]]] will answer all 1965 to present QUESTIONS ON ALL GM'S on mechanics of these cars. Keep in mind i am not there in person i am going on what you are telling me !! PLEASE IF ASKING A QUESTION GIVE ME AS MUCH INFO AS POSSIBLE. THE MORE THE BETTER. SUCH AS YEAR,MAKE,MODEL,ENGINE SIZE. THIS WILL HELP ME HELP YOU. I will not be able to answer all questions because of some situations that i would really need to be there and see things for myself,such as electrical issues. In many cases i would need wiring diagrams. I can also give you an estimate on what the cost would be at our repair shop as an idea to help you. Keep in mind that my answer is ONLY MY ADVICE,ck with your mechanic as well.. >> THANK YOU, TOM..

Experience

I have been a ASE certified master mechanic for over 30 years and certified IN ALL 8 CATEGORIES,[engine repair,engine performance,auto trans,manual trans,clutches,steering and suspension,brakes,electrical systems,heating and air/cond. I am also a state CERTIFIED inspector for over 30 years. I do computer work [pcm]fault codes,pcm flashing,state inspection monitor readiness,repairs on exhaust,fuel service,[injection and carburetor,] charging system problems, running issues,alignments,frame problems,tire balance,struts and of course standard and anti-lock brakes.

Organizations
nys state auto repair industry and ase group.

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N/A

Education/Credentials
high school,4 years of tech school,and many many hours of auto training with many gm classes and aftermarket training classes..

Awards and Honors
ASE MASTER TECH CERTIFIED IN ALL 8 CATEGORIES.NYS INSP LICENSE AND A/C CERTIFIED

Past/Present Clients
MANY CUSTOMERS IN OUR BUSY SHOP.

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