switching the charge read wire

turbo970 · Post by **turbo970** » Wed Oct 14, 2015 7:49 pm

i read online and talked to a alternator rebuild guy about upping the voltage for short periods of time. he said to put a switch on the charge read wire. the Fat white wire in the plug. but he didnt say what kind of switch. could i use a heavy duty on off switch?

mike-tracy · Post by **mike-tracy** » Wed Oct 14, 2015 9:22 pm

Im not advocating you do this, but you'd need a switch rated for the amperage you are going to run temporarily.

robertpaige · Post by **robertpaige** » Wed Oct 14, 2015 10:19 pm

Sounds sketchy to be honest. Lol but i'm with Mike.

turbo970 · Post by **turbo970** » Wed Oct 14, 2015 11:26 pm

he said it interrupts the reading so it lets the alt charge at a higher voltage

turbo970 · Post by **turbo970** » Wed Oct 14, 2015 11:28 pm

https://www.youtube.com/watch?v=NnLbdSu13uU

something like this

Post by **Legacy777** » Thu Oct 15, 2015 6:24 pm

Why are you wanting to do this?

turbo970 · Post by **turbo970** » Thu Oct 15, 2015 8:54 pm

so i can up my voltage during stereo comps.

robertpaige · Post by **robertpaige** » Thu Oct 15, 2015 10:29 pm

makes sense but i'd figure there would be some sort of external controller you can buy and wire in-between that can give you a specific voltage.

turbo970 · Post by **turbo970** » Fri Oct 16, 2015 12:24 am

i wish there was. but the shop guy said to put a switch on the wire that tells the alt to kick on, is suppose to fool the alt to make it think the battery needs some extra voltage

Post by **Legacy777** » Fri Oct 16, 2015 4:16 am

You likely need to hook up to the sense pin. These diagrams below should help

http://main.experiencetherave.com/subar ... nator1.jpg
http://main.experiencetherave.com/subar ... nator2.jpg

turbo970 · Post by **turbo970** » Fri Oct 16, 2015 4:45 am

so looking at this. i need to tap into the white thick wire. well on my subie the sense it the white 12 gauge ish wire

Post by **Legacy777** » Fri Oct 16, 2015 11:59 pm

You are correct, I was wrong earlier.

This diagram also confirms and shows it's pin 2.

http://www.surrealmirage.com/subaru/fil ... uting1.jpg

turbo970 · Post by **turbo970** » Sat Oct 17, 2015 12:46 am

so would a heavy duty on off switch work?

turbo970 · Post by **turbo970** » Sun Oct 18, 2015 4:35 am

mike-tracy · Post by **mike-tracy** » Sun Oct 18, 2015 6:51 am

Based on what you've said, the switch would be simply interrupting a low voltage signal wire. Therefore, you don't need a super heavy duty switch. Might be a good idea to use one anyways because in theory they are better built.

I think that this idea is going to chew through alternator however, but I am curious to hear the results.

turbo970 · Post by **turbo970** » Sun Oct 18, 2015 9:34 pm

its only gonna be switched off so to speak during stereo comps other wise it will be left on for daily

Post by **Legacy777** » Sun Oct 18, 2015 9:51 pm

turbo970 wrote:its only gonna be switched off so to speak during stereo comps other wise it will be left on for daily

Did you mean to say it's only going to be switched "on" for stereo comps and left "off" for daily?

turbo970 · Post by **turbo970** » Sun Oct 18, 2015 10:05 pm

yea my bad lol i was thinking in my head when switch is on the alt would do normal charge and switched off it will do the boosted charge

turbo970 · Post by **turbo970** » Mon Oct 19, 2015 11:26 pm

well i put a switch in and a relay charge goes up but the dash light kicks on.

Post by **Legacy777** » Tue Oct 20, 2015 5:59 pm

What does the voltage go up to?

turbo970 · Post by **turbo970** » Wed Oct 21, 2015 12:10 am

14.4 14.5. i put a diode in and it floats between 13.6 and 14.2. i need to find out if i put a second one in if it will steady things

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switching the charge read wire

switching the charge read wire

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