[Adamdmc]

My voltage has been fluctuating from 14.2vdc down to 13.0vdc for a while and today it dropped to 11.6vdc and stayed between 11.6 and 12vdc for over 75 miles. That's when I noticed the P1135 code for A/F sensor heater. Is it possible that the alternator is good and the sensor is just drawing the voltage down? I don't know if this is going to get me the 150 miles back to the house. Thoughts and suggestions PLEASE!

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[19963.4lsr5]

Hit your Alt with a hammer your brushes are probably needing replaced.


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[brillo_76]

Yup. +1 on the alt shock. Brushes most likely done. You notice if you put your fan on high that it acts like you put it on low when you voltage is low.

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[alumarine]

I'm guessing you're getting those readings from an OBDII device.

I'd use a multimeter on the battery to verify the readings.

Normally the actual voltage is approximately .5 volts lower than what the ECU shows.

[spartacus]

Try not stop and turn off the motor for 150 miles back. Once you are home trickle charge the battery and then replace the brushes on the alternator.

Alternator Brush Replacement - YouTube

[19963.4lsr5]

Originally Posted by alumarine

I'm guessing you're getting those readings from an OBDII device.

I'd use a multimeter on the battery to verify the readings.

Normally the actual voltage is approximately .5 volts lower than what the ECU shows.

My scangauge uses the OBD 12v to show system voltage and its spot on. Same voltage as battery terminals.


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[Adamdmc]

Ya'll are awesome! Sure enough it appears to be the brushes. Will address those as soon as I can. I happen to have a donor 4runner that I'm going to steal the alternator out of and test this afternoon. I made it home but not without some craziness. For any of you guys hating on the Lithium Ion booster packs, they are more handy than you can imagine. This one got me the last 15 miles to the house.

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[19963.4lsr5]

My local dealer had brushes the next day.


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[3bears]

the brushes are easy to do, and if were me, if I was taking another used alternator to slap in, I would either put new brushes in it first, or slap in the used, put brushes in original and swap back.

[brillo_76]

Originally Posted by Adamdmc

Ya'll are awesome! Sure enough it appears to be the brushes. Will address those as soon as I can. I happen to have a donor 4runner that I'm going to steal the alternator out of and test this afternoon. I made it home but not without some craziness. For any of you guys hating on the Lithium Ion booster packs, they are more handy than you can imagine. This one got me the last 15 miles to the house.

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I was thinking of getting one and keeping it the rig.. Glad to see they work . ;-)

[Endlessblockades]

Originally Posted by brillo_76

I was thinking of getting one and keeping it the rig.. Glad to see they work . ;-)

I recently got a NOCO Genius charger - this is a great use of the boost/jump pack - may have to add it to the kit.

[19963.4lsr5]

Originally Posted by brillo_76

I was thinking of getting one and keeping it the rig.. Glad to see they work . ;-)

I’m torn between a LIPO pack like he used or the larger gell cell like my friend uses for his garage and towing service.


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[brillo_76]

Originally Posted by 19963.4lsr5

I’m torn between a LIPO pack like he used or the larger gell cell like my friend uses for his garage and towing service.


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The lipo take a lot longer to charge. So plus and minus to both of them I am sure.

[Adamdmc]

Originally Posted by 3bears

the brushes are easy to do, and if were me, if I was taking another used alternator to slap in, I would either put new brushes in it first, or slap in the used, put brushes in original and swap back.

I'm not sure if the one in the donor is a Denso, but the Denso with bad brushes will definitely be getting a refreshing. The ultimate goal is to completely rebuild engine and tranny from donor and swap them out and then rebuild current engine and tranny to have as a backup.

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[Adamdmc]

Originally Posted by 19963.4lsr5

I’m torn between a LIPO pack like he used or the larger gell cell like my friend uses for his garage and towing service.


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As someone who drives all the time and as many as 40 different vehicles a week, the NOCO is compact and light enough to just throw in a small backpack and always have with you. I don't have any experience with the larger ones so I won't speak to that option.

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