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CHECK ALTERNATOR DRIVE BELT TENSION IF BELT LOOK LOOSE ADJUST DRIVE BELT TENSION.IF YOU HAVE AUTOMATIC BELT TENSIONER CHECK FOR FOR BROKEN BELT TENSIONER. IF DRIVE BELT LOOK OKAY.CHECK ALTERNATOR VOLTAGE OUT PUT AT BATTERY WHILE ENGINE IDLING.BATTERY VOLTAGE SHOULD BE 13.5 - 14.5 VOLTS. IF NOT ALTERNATOR FAULTY.FIRST CHECK ALTERNATOR FUSE AND CHECK ALTERNATOR POWER FEED WIRE AND VOLTAGE REGULATOR WIRES FOR DAMAGE OR LOOSE CONNECTIONS. FIRST TURN OFF RADIO BEFORE REMOVING NEGATIVE BATTERY CABLE TO KEEP FROM LOCKING OUT RADIO.
If your looking at your altenator you will have 2 brackets 1 holds the unit on the vehicle other bracket is sloted the sloted bracket is the tensioner besure to not overtighten leave a little deflection or you will wear out your altenator bushing /bearing.
Below the altenator is a tensioning pully, insert a 3/8" ratchet or breaker bar in the square hole on the tensioner and release the tension on the surpentine belt and remove the belt. Route the new surpentine belt in place up to the altenator and take the tension off the tensioner and put the belt over the altenator pully. Double check to make sure the belt is riding correctly on all the pullies before starting. Crank the engine over several times before starting to seat the belt.
GET LOND DRIVE 3/8 RACHET OR BELT TOOL AND PLACE ON THE BELT TENSIONER AND PUSH THE TENSIONER YOU WILL SEE BELT IS LOOSEN REMOVE THE BELT FROM THE ALTENATOR PULLEY AND LET THE TENSIONER GO SLOWY AND REMOVE THE COMPLETE BELT. COMPARE THE OLD BELT FOR SIZE AND MAKE SURE THEY ARE EXACT MATCH. YOU HAVE BELT SCHEMATIC TOP OF THE WATER PUMP START FROM THE BOTTOM CRANK PULLEY PLACE THE BELT AND MAKE SURE DONT MISS TEETH OUT OR INSIDE. A/C PULLEY WATER PUMP POWER STEERING IDLE PULLEY AND OTHER SIDE PLACE ON TENSIONER PULLEY TO AND PUSH THE TENSIONER AGAIN AND PLACE THE ALTENATOR PULLEY AND YOU ARE DONE. BEFORE START TO ENGINE FALLOW THE COMPLETE BELT FOR PERFECT SIT AND CORRECT POSITION.SHOULDNT BE TOO TIGHT OR TOO LOOSE.
Disconnect neg battery cable, then unplug wire harness on altenator. Then remove bolts to remove. When putting back on, put altenator on first, then belt. There will be a tensioner pulley that you can pry down or pull up with breaker bar and socket to get belt back on. Try to keep belt in place as much as possible with altenator out so you won't loose track of the routing.
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Disconnect battery, disconnect altenator wire harness. Remove bolts and pull out altenator. When reinstalling new altenator, there should be an adjustable pulley called tensioner pulley that will either have to be pulled up or pushed down in order to put belt back on.
its not hard to replace an alternator,,,there are 2 bolts that hold it in place that you have to take out.make sure you take the pos battery cable loose so you dont short anything out , once you remove the bolts he alternator will move freely there is a wiring harness hooked to the back of it that you have to take loose and then you can pull the alternator off the try.you put it back the same way you took the old one off and when you go to tighten the belt you need a prybar to apply tension against the alternator and then as you keep that tension on therer you tighten the golts to keep the belt tight. thats about all there is to it
It's actually super easy.
All you need is your year and make alternator belt and a wrench.
Take off the existing altenator, take off the old belt.
Once the altenator is off you'll be able to look further down below where the altenator was. You'll see a metal wheel that's a little bigger than the one on the altenator. This is where the new belt needs to wrap around.
I found it alot easier to wrap the belts around the two wheels before putting the altenator back on the engine.
Make sure that all bolts and seals are sound. (that's the last thing you need falling off in the middle of nowhere!)
Hope it helped!