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Chevrolet Repair/91 s10 blazer electronic speedometer

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Question
Tom
My blazer's speedometer comes on and goes off at its own whim. I got one from a salvage yard and it does the same thing. How can I check to see if it is getting power. I have no fancy test equipment. I sent my old speedometer off to be repaired and am waiting for its return, want to make sure its not an electrical problem before I reinstall it.
Thanks
Ron

Answer
HI RON, DO YOU KNOW THAT THIS HAS A VSS. SPEED SENSOR ON TAIL SHAFT OF TRANSMISSION..WE HAVE HAD PROBLEMS WITH THIS..CK FOR VOLTAGE ON THE PURPLE AND WHITE WIRE OUT OF THE SENSOR WHEN THE TRANS IS IN GEAR YOU SHOULD SEE A CHANGE IN THE VOLTAGE..IF NO VOLTAGE CHANGE THE VSS IS BAD,PROVIDING YOU DO HAVE POWER DOWN ON ONE OF THESE WIRES.IF NO VOLTAGE AT ALL TO THIS SENSOR CK FOR A OPEN IN  THE WIRING.. BUT IF YOU MEAN THE LIGHT ON THE SPEED GOES OUT MORE THEN LIKELY THE SPEEDO HEAD CIRCUIT BOARD IS BAD..THIS IS WHAT YOU ARE SENDING OUT FOR REPAIR I WILL ASSUME...THE OTHER PROBLEM IS MAKE SURE THERE IS POWER TO THE DASH ASSEMBLY WHERE YOU REMOVED IT FROM THE DASH FACE OR HEAD...IF I DID NOT ANSWER YOUR QUESTION,,GET BACK TO ME...GOOD LUCK TO YOU,,,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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