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Chevrolet Repair/1988 chevy 4x4

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Question
QUESTION: I have boughten a 1988 k1500 chevy 4x4. My problem is when I put it in 4 wheel drive my voltage gauge drops for a few seconds and than my gauge fuse blows and the 4wheel does not engage. I tried 4low the rear end goes to low gear but 4wheel still doesn't work. Any ideas as to what might cause this. Thanks for your time.  Rusty from minnesota

ANSWER: HI RUSTY ,I WILL ASSUME THIS IS A ELECTRIC 4WD PUSH BUTTON AND NOT THE FLOOR MOUNTED SHIFTER.. THIS SOUNDS LIKE THE ACTUATOR IS SHORTING OUT CAUSING THE VOLTAGE TO DROP BECAUSE OF THE SHORTED OUT MOTOR..THE FUSE THAT POWERS THIS IS MORE THEN LIKELY ON THE GAUGE CIRCUIT..I WOULD SUGGEST YOU REMOVE THE WIRING HARNESS TO THE ACTUATOR ON THE TRANSFER CASE AND THEN PUT IT IN 4WD [WHICH IT WILL NOT DO] BUT LETS SEE IF THE FUSE POPS AND THE VOLTAGE DROPS..IF ALL IS OK I WOULD THINK THE ACTUATOR MOTOR IS JUST SHORTED OUT. THIS IS WHAT LOCKS THE TRANSFER CASE IN 4WD AND SENDS POWER TO THE FRONT AXLE TO LOCK IT IN..LET ME KNOW HOW THIS GOES AND GET BACK TO ME IF NEED BE.
GOOD LUCK TO YOU,,,TOM

---------- FOLLOW-UP ----------

QUESTION: It is a floor shifter. Could it still be the acuator? And thanks for the fast response.

Answer
HI RUSTY AGAIN,THIS WILL NOT HAVE A ACTUATOR FOR THE TRANSFER CASE IF IT HAS A FLOOR MOUNTED SHIFTER..BUT WHAT IT DOES HAVE IS THE MOTOR THAT LOCKS THE FRONT 2 AXLES TO EACH OTHER...I FORGOT WHAT YEAR THEY WERE THAT HAD ELECTRIC SOLENOID OR VACUUM..LOOK AT THE PASS SIDE FRONT AXLE AND SEE IF THERE IS A VACUUM DASH POT OR ELECTRIC SOLENOID,IF ELECTRIC REMOVE THE HARNESS TO IT AND TRY TO PUT IT IN 4WD LIKE THIS AND SEE IF THE FUSE POPS AND GAUGE DROPS..IF NOT I SUSPECT THIS SOLENOID IS BAD,,SHORTING OUT,,OR WIRE HARNESS PROBLEM..LET ME KNOW,,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

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MANY CUSTOMERS IN OUR BUSY SHOP.

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