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No electrical power after replacing the alternator and fuse?

Tiny
MBFOR99
  • MEMBER
  • 2011 GMC ACADIA
  • 3.6L
  • V6
  • 2WD
  • AUTOMATIC
  • 165,000 MILES
Replaced alternator, replaced alternator fuse, no power whatsoever in vehicle. Jumped it off, no power just cut right off. It was idling for around 20 minutes and shut off. Changed two batteries and I still have no power at all nothing. Please help.
Wednesday, September 14th, 2022 AT 8:30 PM

8 Replies

Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
Was the truck running for 20 minutes without it connected to the jumper after it started? If it did, I would check the battery terminals and wires, sometime a little corrosion that you can't see in one of the cables. It may be a loose or corroded wire that is not making a connection. Try grounding the negative side of the battery with a wire and then to the ground side of the frame.
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Thursday, September 15th, 2022 AT 7:58 AM
Tiny
MBFOR99
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Yes, it was then completely shut off. Also, I can't seem to get the positive side of the battery to light with a test light. Could it also be a bad positive terminal?
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Thursday, September 15th, 2022 AT 9:24 AM
Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
Disconnect the battery on both terminals, then try the test light to see if it lights. The batteries you had tried were new or used and had been charged? If you do get the test light to go on clean the terminals going to the battery.
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Thursday, September 15th, 2022 AT 9:59 AM
Tiny
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Both were new.
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Thursday, September 15th, 2022 AT 10:25 AM
Tiny
MBFOR99
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  • 46 POSTS
Also, one thing I am not understanding is the positive wire actually has a fuse that I replaced yesterday, but when I connect that terminal and use a test like the fuse isn't even hot.
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Thursday, September 15th, 2022 AT 10:56 AM
Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
Was looking through a couple of GM, try taking the wire with the fuse and ground it out. If it is hot, you should get a spark from the wire where you ground it out.
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Friday, September 16th, 2022 AT 10:44 AM
Tiny
MBFOR99
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  • 46 POSTS
Okay, so, I actually have fire at that fuse and wire, but the light on the test light was very dim, so I'm thinking maybe I have a break somewhere in that wire is why I'm not getting any power to the vehicle at all. Does it have a main fuse or fuses I can check?
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Friday, September 16th, 2022 AT 11:16 AM
Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
There is a fusible link connected to the battery. Check it for a bad fuse connection.
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Saturday, September 17th, 2022 AT 7:18 AM

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