RX7Club.com - Mazda RX7 Forum - Running positive wire from battery to alt for better voltage

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rx7junkie170

11-13-18 11:27 AM

Running positive wire from battery to alt for better voltage

I want to run a wire directly from my battery to my alt and ground it I was told I’ll get better voltage where is the positive terminal on the stock 85 alt

Siraniko

11-13-18 12:04 PM

B terminal (the stud with a nut) but I highly recommend installing a breaker for safety reasons.

SKYDRIFTER350

11-13-18 12:55 PM

Don't ALL cars have a wire from the ALT to the BATT?

otherwise, how does the BATT get it's electricity?

Hell167

11-13-18 01:37 PM

I think it's meant to be a thicker guage wires.

GSLSEforme

11-13-18 02:01 PM

Reread original post. He wants to run a wire from battery to alt and GROUND it...and then asks which terminal is the output terminal.

KansasCityREPU

11-13-18 02:42 PM

I did this. Just run a two foot pre-made battery cable from the BATT neg to the long ALT bolt where the nut attaches.

KansasCityREPU

11-17-18 08:56 AM

What I actually did was run a pre-made two foot battery cable that has eyes on both ends from the drivers side factory spot for the ground to the long bolt on the alternator. I did not do anything with the positive side of the alternator and just left the factory wire.

The issue I had was that I buffed out the alternator and powder coated with clear. This caused grounding issues. Hence the need for the extra ground cable.

https://cimg7.ibsrv.net/gimg/www.rx7...7535f7fa89.jpg

rx7junkie170

11-17-18 01:10 PM

https://www.ebay.com/itm/CAR-AUDIO-2...IAAOxyY3ZRzinz I orderred this one where would I put it on the positive side of the battery wire going to the alt ?

rx7junkie170

11-18-18 10:33 AM

Just ran a negative to the alt getting 14v on the meter instead of 12v

SKYDRIFTER350

11-19-18 07:17 PM

You will always need more than 12v or else You will have no charging... If You only had 12v coming out of the alt. & if Ur battery had 12.5v...... the battery would be charging Ur alternator..!! LOL... think of it like water... voltage flows downhill.

mazdaverx713b

11-20-18 07:13 AM

If you weren't getting 14V before the wire install, then the alternator is more than likely on its way out. The alternator should be charging, without help, at 14V.

Ckforker

11-20-18 07:26 AM

I did the same thing going directly from battery to alt. After testing, found that I needed to replace several other ground wires and now pretty consistent 14.2 volts and no battery issues.

Sh00bs

11-25-18 09:08 AM

get an FD alt and retrofit.

https://cimg0.ibsrv.net/gimg/www.rx7...67fdc605a5.gif

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