07 RX350 Alternator Upgrades? what's healthy voltage?
#1
Driver School Candidate
Thread Starter
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Hello folks,
Acquired an RX350 several months ago, and have been transferring all my equipment to it. My last car, an 04 Mustang V6, I had to install a higher capacity alternator and Optima Yellow-top just to keep from killing it.
This RX has the full towing package (including hitch), which is supposed to include a beefed up alternator. However, running several DC accessories and a 400watt AC Inverter has my TechStream reporting 13.3-12.9v DC.
Suggestions for a solution? Bigger alternator? Second battery (and-or where to put it)? Probably going to be ordering a Yellow-top soon regardless.
Thanks!
Acquired an RX350 several months ago, and have been transferring all my equipment to it. My last car, an 04 Mustang V6, I had to install a higher capacity alternator and Optima Yellow-top just to keep from killing it.
This RX has the full towing package (including hitch), which is supposed to include a beefed up alternator. However, running several DC accessories and a 400watt AC Inverter has my TechStream reporting 13.3-12.9v DC.
Suggestions for a solution? Bigger alternator? Second battery (and-or where to put it)? Probably going to be ordering a Yellow-top soon regardless.
Thanks!
Last edited by AngelMarie; 09-17-18 at 10:22 AM.
#2
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Can yu get to alternator terminals? Remove them and clean? Before panicking? Question also is, where from is TS reading the voltage? At what point in that circuit? At alternator? At battery?
To fully charge in reasonable times, alternator output must be 14.2 V to 14.5 V as measured right across the battery posts.
https://www.google.com/search?source...30.MbfgWUwSPhA
To fully charge in reasonable times, alternator output must be 14.2 V to 14.5 V as measured right across the battery posts.
https://www.google.com/search?source...30.MbfgWUwSPhA
#3
Instructor
iTrader: (1)
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Tow package alternator isn't that much bigger than stock, ~130 amps vs ~100 amps, not sure why Lexus makes it seem like such a big deal. I've put 250 amps alternators on cars with a big three upgrade for a banging sound system, that's a significant upgrade. Toyota/Lexus does have a few HO alternators (160-250 amp) lingering around the internet, you have to look as it's not a great selection compared to American cars. Mechman can also make you a custom one if money is no issue. But, with any HO alternator, you need the big three upgrade otherwise you're bottlenecking the power through the tiny stock wires. You can actually try a big three without a new alternator and see if that makes a difference.
Also, personal take but Optima batteries are past their prime and are mostly just hype now. I've had a few go bad on installs I do and have dropped them completely. If I need an AGM battery, XS Power or Stinger are my choices. Otherwise standard Interstate batteries from Costco have not failed me yet.
Also, personal take but Optima batteries are past their prime and are mostly just hype now. I've had a few go bad on installs I do and have dropped them completely. If I need an AGM battery, XS Power or Stinger are my choices. Otherwise standard Interstate batteries from Costco have not failed me yet.
#4
Driver School Candidate
Thread Starter
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Can yu get to alternator terminals? Remove them and clean? Before panicking? Question also is, where from is TS reading the voltage? At what point in that circuit? At alternator? At battery?
To fully charge in reasonable times, alternator output must be 14.2 V to 14.5 V as measured right across the battery posts.
https://www.google.com/search?source...30.MbfgWUwSPhA
To fully charge in reasonable times, alternator output must be 14.2 V to 14.5 V as measured right across the battery posts.
https://www.google.com/search?source...30.MbfgWUwSPhA
#5
Driver School Candidate
Thread Starter
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
.....
Also, personal take but Optima batteries are past their prime and are mostly just hype now. I've had a few go bad on installs I do and have dropped them completely. If I need an AGM battery, XS Power or Stinger are my choices. Otherwise standard Interstate batteries from Costco have not failed me yet.
Also, personal take but Optima batteries are past their prime and are mostly just hype now. I've had a few go bad on installs I do and have dropped them completely. If I need an AGM battery, XS Power or Stinger are my choices. Otherwise standard Interstate batteries from Costco have not failed me yet.
Thanks for the thoughts on alternators also.. I didn't want to go much higher than what the factory wires can handle at this point. I suppose I could look around for a ~160A unit, but would not go any higher. Heaviest load scenario is that I might go with a 500-600watt inverter, enough to run a couple laptops, a cell booster, and any other accessories on a long trip, plus trailer.
Thread
Thread Starter
Forum
Replies
Last Post
ArmyofOne
Maintenance
6
11-22-08 03:15 PM