Original Poster: Colin
Difficulty: 2 out of 10
Time to install: Under an hour
Vehicle: 1998 Mazda B4000
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Brief Explanation: Although about 30% larger physically, the 130 amp alternator is a direct bolt-on upgrade with no modifications needed. My 95 amp alternator was starting to fail in my truck. When I went in to the parts store to get a new one, the guy at the counter told me the 130 amp was the the same price. Needless to say I got the 130 amp one.
- 8mm, 10mm, and 1/2″ sockets
- 3/8″ and 1/4″ ratchets
- 3-inch 3/8″ extension
- small flathead screwdriver
- Trim removal tool (for the Chirstmas tree pin)
- 130 amp alternator
- New belt (optional)
Step 1: Disconnect the battery. (If you feel the need to do so)
Step 2: Using the 8mm socket and 1/4″ ratchet, loosen the hose clamps on the air intake hose. Undo the electrical connectors so you can move the hose out of the way.
Step 3: Using the 3/8″ ratchet move the belt tensioner counter-clockwise to relieve belt tension and remove the belt. (You may want to make a drawing of your belt routing if your sticker on the rad support is missing/unreadable)
Step 4: With the 3/8″ ratchet, 1/2″ socket and extension remove the 3 bolts holding the alternator. (Penetrating fluid may be helpful) There’s a Christmas tree pin holding a coolant hose on the side of the alternator, pop it off.
Step 5: Using the 10mm socket and 1/4″ ratchet remove the main power cable. (If you didn’t disconnect the battery, wrap the end in a rag to prevent shocks) With the small flathead undo the two connectors.
Step 6: Reconnect the two connectors and the power cable.
Step 7: Line up the alternator on the motor, start the bolts by hand to prevent cross-threading and ensure proper alignment. Pop the Christmas tree pin back in the hole on the alternator.
Step 8: Tighten the bolts. They don’t need to be reefed on, just good and tight.
Step 9: Re-install the belt, make sure its routed properly. I used a new belt. My old belt was still in decent shape so I’m keeping it as an emergency back-up.
Step 10: Re-install the intake hose. Make sure you tighten the hose clamps and re-connect all connectors.
How to Install a 130 amp Alternator in Your Ranger