Hi all

I have been having this random flat battery issues. With random I mean that the car could have no issues what so ever for a week but ended up with a flat battery next morning .

Measuring the dark current, even monitoring it over several hours, showed nothing strange. OK the dark current on my car, 90mA, was a bit higher then the 50mA Mazda mentions, but surely not enough to drain the battery overnight.

Some time passed... I changed the battery with a new one and the car was fine ...for about 7 days

I started all over and started monitoring the dark current. Couldn't find a thing wrong until this afternoon(!) I measured again and saw a current of 1.8 amps !!! I was so happy LOL finally some sort of starting point...

I started with removing the room fuse, etc... nothing changed...

When I disconnected the battery I could hear a "click".. (sounded like a relay!)

To make a long story short,I traced it and it seems the FUEL relay stays on !

I changed the relay, same issue.

When I disconnect the battery, as mentioned, I hear the relay disengage and when I connect the battery again, the relay stays off!

Did anyone else had this issue?

Cheers

Steve

I've never heard of it. Good troubleshooting so far.
page 24 of the electrical section of the manual seems to show two relays for the fuel pump.
http://smrmicro.com/rx8servicemanual/

No, Ive read most of the post for for years.. Never heard of it.

Thanks for the reactions guys, I will take a look at the manual in the link :)

I downloaded the manuals :D: .

Fuel relay -> whoopsie -> goes to PCM .. grrr..

Ok, so it seems the time has come to put a relay between the juice going to the Interceptor.... and the 12V -> ignition key...

I'll post my findings....

No more flat batteries thanks to a relay between the Interceptor EMS!!

So it is a fact that the Interceptor triggers the FUEL relay (combination af GPS screen ON/OFF, HEATING ON/OF, RADIO ON/OF) drawing about 1.8 amps !

But as said .. problem solved !!! ANd that is all that matters ! :eyetwitch

Good work dude! I had to replace my battery last month--i was also at the time running the int x
oscd

so:

interceptor X + RX8 = dead car batteries?

so:

interceptor X + RX8 = dead car batteries?

Love to see somebody else with an INT-X repeat this experiment concerning the fuel relay.
I'd also like to see the current draw with and without the X with everything off.
I sent the OP a PM, because I had read in one of the repair manuals that the off current draw should be around 20mA when measured on the negative side.....not as he listed. Anyone really know?
Oh...........wasn't sure of the terminology used.........."dark current".......... as well.

Love to see somebody else with an INT-X repeat this experiment concerning the fuel relay.
I'd also like to see the current draw with and without the X with everything off.
I sent the OP a PM, because I had read in one of the repair manuals that the off current draw should be around 12-15mA when measured on the negative side.....not has he listed. Anyone really know?
Oh...........wasn't sure of the terminology used.........."dark current".......... as well.


Dark current = current flow from the battery when the car is parked and off, no lights on, etc...

The original spec was maximum dark current of 20 mA, iirc, but was subsequently raised to 50 mA. That means, if you measure more than 50 mA, then something is wrong. Or, maybe you have some aftermarket part drawing additional power.

50 mA is bigger than some may realize. At that rate, 3 weeks, will drain 25 Amp-Hours from your battery. That's a pretty big hit, even for a good battery in new condition.

Dark current = current flow from the battery when the car is parked and off, no lights on, etc...

The original spec was maximum dark current of 20 mA, iirc, but was subsequently raised to 50 mA. That means, if you measure more than 50 mA, then something is wrong. Or, maybe you have some aftermarket part drawing additional power.

50 mA is bigger than some may realize. At that rate, 3 weeks, will drain 25 Amp-Hours from your battery. That's a pretty big hit, even for a good battery in new condition.

Thanks..........figured that was what "dark current" was, just hadn't heard that term.
Oh..........Where did you get the 50mA number?
BTW..............I went back and read my other post to someone where I actually did go look up the number and it is 20mA standard, so I changed my post above so nobody would get confused in the future.

No more flat batteries thanks to a relay between the Interceptor EMS!!

So it is a fact that the Interceptor triggers the FUEL relay (combination af GPS screen ON/OFF, HEATING ON/OF, RADIO ON/OF) drawing about 1.8 amps !

But as said .. problem solved !!! ANd that is all that matters ! :eyetwitch




I think I am having this very same problem. Testing Steve's theory tonight

2004 GT MT
20065 mi
Int-X ems

this has been reported before and Scott at Mazsport posted a fix. I think the fix was... it was incorrectly wired.

You'll have to do a search.

Hey SpeedSteve, what exactly did you do to solve the problem? Where did you install the new relay? I have the same problem, but I pulled the EGI relay.

Hi there

Update : some time passed, and yep.. the problem is solved >..

What I did is very simple :)

I took a 12V signal (main fuse box) -> from the "Wiper" fuse to feed the relay.

When powering the 12V signal activates the relay -> the closing contact powers the Interceptor. Ignition off -> relay goes off -> power to the Interceptor goes off -> fuel relay goes off -> no more problems!

TIP! be sure to remove the fuse (+ side of the Interceptor) when you work on this. Put the fuse back in when you finish the setup to protect your interceptor!

It is all very simple, but it works great!

Cheers!

Steve

PS: If you want I can make a DIY topic about it ... (this weekend)

Hi there



Steve

PS: If you want I can make a DIY topic about it ... (this weekend)


that would be a good thing to do.. and thanks steve. good job.


beers :beer: