Low voltage while driving? - Toyota RAV4 Forums
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post #1 of 19 (permalink) Old 02-16-2017, 01:01 AM Thread Starter
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Low voltage while driving?

So a couple times i have had issues with my rav not wanting to start. One minute it will start fine then the next it won't. It did it for a few days back around August then not again till last week. I replaced the positive terminal clamp and all seemed fine until today. While cruising down the highway i noticed my voltage was at 12.5v for most of the drive except when i completely let off the gas, then it went up to 14.5v until i accelerated again. What would cause this?

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post #2 of 19 (permalink) Old 02-16-2017, 08:45 AM
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Year, model, miles?

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post #3 of 19 (permalink) Old 02-16-2017, 10:13 AM Thread Starter
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My bad. It's an 07, 3.5 liter with 410000km

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post #4 of 19 (permalink) Old 02-16-2017, 10:28 AM
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Quote:
Originally Posted by tRAVellintom View Post
So a couple times i have had issues with my rav not wanting to start. One minute it will start fine then the next it won't. It did it for a few days back around August then not again till last week. I replaced the positive terminal clamp and all seemed fine until today. While cruising down the highway i noticed my voltage was at 12.5v for most of the drive except when i completely let off the gas, then it went up to 14.5v until i accelerated again. What would cause this?

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Why did you replace the terminal clamp, was it corroded? I'd start with a load test(not just a VM test)of the battery.
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post #5 of 19 (permalink) Old 02-16-2017, 10:54 AM
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also good to know is the age of the battery. They don't last forever and if you're is original (doubt it) I'd be inspecting that first. As was said earlier, a load test on the battery is necessary (not just simply determining output volts).
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post #6 of 19 (permalink) Old 02-16-2017, 11:45 AM Thread Starter
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I replaced it cuz the one i had on was getting pretty old and felt kind of cheap. I did do a load test back in August when it first did this to me and it was fine

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post #7 of 19 (permalink) Old 02-16-2017, 12:02 PM
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Ok, so just to confirm, I'd do the load test again and make sure the cold cranking amps (CCA) is solid. If that's confirmed, next to check is the alternator, (cables and attachment) along with drive belt, tensioner and alternator output as well. You may need to go to a shop or auto parts place to have them check the alternator.
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post #8 of 19 (permalink) Old 02-16-2017, 02:58 PM Thread Starter
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And just on my way home it held steady at 14.2 volts. Will still have the battery/charging properly tested though

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post #9 of 19 (permalink) Old 02-16-2017, 03:12 PM
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Quote:
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...While cruising down the highway i noticed my voltage was at 12.5v for most of the drive except when i completely let off the gas, then it went up to 14.5v until i accelerated again. What would cause this?
So you must have a voltage monitor maybe plugged into the 12V outlet for continuous, right?
If you got the number of zeros right, 410,000 km translates to 255,000 miles, and if it's the original alternator, I'd suspect its brushes are about worn out.
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post #10 of 19 (permalink) Old 02-16-2017, 03:16 PM Thread Starter
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Yes there are 409,625km. I have installed a volt meter in place of the cigarette lighter. I'm sure it is the factory alternator. I've been eyeing up a 250 amp alternator but would that be too much? I have an aftermarket sound system and plan to add a bigger amp and another sub

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