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Chevrolet Repair/1987 S10 Pickup Truck

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Question
What would cause an 87interview S10 pickup to stop running when you turn on headlights, blow the horn or turn on the heater's fan. Headlights will not come on at all.

Answer
HI BEVERLY, THE DEVIL !!!! SOUNDS LIKE THERE IS A SHORT IN THE WIRING SOMEWHERE. I WILL ASSUME THE TRUCK WILL RUN OK IF YOU DO NOT TURN ON THE HEADLIGHTS, CORRECT ??? IF SO WE CAN RULE THE ALTERNATOR OUT OF THE PROBLEM..I THINK YOU WILL FIND A SHORT IN THE HEADLIGHT WIRING HARNESS. LOOK UNDER THE HOOD FOR THE MAIN WIRING HARNESS THAT FEEDS THE HEADLIGHTS..START AT THE HEADLIGHTS AND WORK BACK FROM THERE,SEE IF YOU SEE ANY WIRING THAT IS PINCHED OFF CORRODED OR JUST DOES NOT LOOK GOOD. IF YOU DO NOT SEE ANYTHING OUT UNDER THE HOOD LOOK WHERE THE WIRING GOES THROUGH THE FIREWALL [UNDER DASH] LOOK FOR THE SAME THING AS I SAID ABOVE. IT SOUNDS LIKE YOU MAY HAVE THE PROBLEM AROUND THE HEADLIGHT SWITCH OR IN THE AREA OF THIS BECAUSE IT IS TURNING ON THE BLOWER MOTOR CIRCUIT WHEN IT SHORTS OUT. AS FAR AS THE ENG STOPPING IS BECAUSE THIS SHORT IS DRAWING TO MUCH CURRENT FOR THE SYSTEM TO HANDLE..CK TO SEE IF THE HEADLIGHTS TURN ON WHEN THE TRUCK IS OFF. CK FOR A DIM LIGHT AND GO AFTER THAT WIRING HARNESS. THIS MAY TAKE SOME TIME TO DIAGNOSE. LET ME KNOW MORE AS YOU GO ON..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.

Publications
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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