I did know what caused this.. Something to do with the stock under dash wiring not being able to pass a current without a voltage drop I think.
The alt senses the drop and compensates by pumping up output.
I think.
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| High (15.2V) voltage output from Falcon alt? https://www.auszookers.com/forum/viewtopic.php?f=5&t=6600 |
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| Author: | birko [ Sat Sep 12, 2009 3:39 pm ] |
| Post subject: | High (15.2V) voltage output from Falcon alt? |
Hi, Just finished my falcon alt conversion but have found that the output from the alternator is gradually increasing the more load is put on it. ie, it runs at 14.4, then with the lights on at 14.8, then lights/ heater fan at 15.2. Any ideas what this is and how to fix it? |
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| Author: | want33s [ Sat Sep 12, 2009 9:54 pm ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
I did know what caused this.. Something to do with the stock under dash wiring not being able to pass a current without a voltage drop I think. The alt senses the drop and compensates by pumping up output. I think.
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| Author: | royce [ Sat Sep 12, 2009 10:55 pm ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
measure the volatage at teh battery and at the volt sense wire on the alternator (the one with power on it at ignition) they will be probably reading heaps different |
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| Author: | joeblow [ Sun Sep 13, 2009 12:11 am ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
the regulator is not doing its job. sort it out quick before other stuff gets fried. |
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| Author: | birko [ Sun Sep 13, 2009 6:48 pm ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
Quote: measure the volatage at teh battery and at the volt sense wire on the alternator (the one with power on it at ignition) they will be probably reading heaps different Yep, They are. The wire is reading around 13.5v Quote: the regulator is not doing its job. sort it out quick before other stuff gets fried.
Yep i no, im not driving it like this. |
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| Author: | Damo [ Sun Sep 13, 2009 7:03 pm ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
birko wrote: Quote: measure the volatage at teh battery and at the volt sense wire on the alternator (the one with power on it at ignition) they will be probably reading heaps different Yep, They are. The wire is reading around 13.5v So what causes that? Is it the wire in the stock loom not big enough? Or just something like a bad connection somewhere? |
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| Author: | Rockhopper [ Mon Sep 14, 2009 12:12 am ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
Damo wrote: birko wrote: Quote: measure the volatage at teh battery and at the volt sense wire on the alternator (the one with power on it at ignition) they will be probably reading heaps different Yep, They are. The wire is reading around 13.5v So what causes that? Is it the wire in the stock loom not big enough? Or just something like a bad connection somewhere? could be both. If you're running stock wiring on the alternator, try running a thicker wire back to the battery. Only way to really diagnose it is to follow the wiring back from the alternator and test it at differant points and find where the voltage drop is |
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| Author: | royce [ Mon Sep 14, 2009 1:00 am ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
nah the ignition sense wire comes from the key via about 12m of wire!!!!! so it drops voltage along the way and from other things loading it up (like lights and stuff) Nissvit posted about fitting a relay so the standard wire switches a feed straight from the battery so it tracks it better |
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| Author: | birko [ Tue Sep 15, 2009 12:29 am ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
Yep, it got a upgraded charge wire. I will try shorting the sense wire directly to the battery and see what the result is. But yep a relay seems like a good idea |
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| Author: | birko [ Tue Sep 15, 2009 2:42 pm ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
Quote: Nissvit posted about fitting a relay so the standard wire switches a feed straight from the battery so it tracks it better
Searched but couldnt find it |
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| Author: | nissvit [ Thu Sep 17, 2009 12:57 am ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
At the back of the alternator there is two wires, one does the battery light thing, and the other provides the sense voltage (and field excitation current). Run the sense wire out to the trigger coil relay of a relay (pin 85 or 86 on a bosch relay) run the other side of the relay coil (the other pin of 85 or 86) to earth. Run a fused wire directly from the battery to pin 30 of the relay then run a wire from pin 87 ( the two switched pins on the relay) out to the sense wire input on the alternator. this will bypass all of the original under-dash wiring, and now the alternator will see the true battery voltage with minimum losses... so it will provide better voltage regulation.. do not run a wire directly from the battery to the sense input on the alternator, as this will keep the field windings continually energized, which will drain the battery... |
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| Author: | want33s [ Thu Sep 17, 2009 10:41 am ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
Very handy info there Nissvit... Thanks. |
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| Author: | steve [ Thu Sep 17, 2009 11:16 am ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
if there's any chance to run more relays nissvit will find a way, he loves em. |
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| Author: | Saam [ Thu Sep 17, 2009 8:48 pm ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
still could be the regulator aswell |
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| Author: | Damo [ Thu Sep 17, 2009 11:38 pm ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
steve wrote: if there's any chance to run more relays nissvit will find a way, he loves em.
I have a similar love of relays. Actually, I love them as much as I hate scotchlocks 
Relays FTW!!! Waiting for Ford alternator to arrive, then i'll give this a crack 
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| Author: | shep [ Thu Sep 17, 2009 11:46 pm ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
Damo wrote: steve wrote: if there's any chance to run more relays nissvit will find a way, he loves em. I have a similar love of relays. Actually, I love them as much as I hate scotchlocks Relays FTW!!! Waiting for Ford alternator to arrive, then i'll give this a crack you would have liked my bike then, i recon that it had 30 relays on the thing. |
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| Author: | steak_knife [ Fri Sep 18, 2009 12:42 am ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
shep wrote: Damo wrote: steve wrote: if there's any chance to run more relays nissvit will find a way, he loves em. I have a similar love of relays. Actually, I love them as much as I hate scotchlocks Relays FTW!!! Waiting for Ford alternator to arrive, then i'll give this a crack you would have liked my bike then, i recon that it had 30 relays on the thing. Running What?? |
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| Author: | Mike [ Fri Sep 18, 2009 2:40 am ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
steknig wrote: shep wrote: Damo wrote: steve wrote: if there's any chance to run more relays nissvit will find a way, he loves em. I have a similar love of relays. Actually, I love them as much as I hate scotchlocks Relays FTW!!! Waiting for Ford alternator to arrive, then i'll give this a crack you would have liked my bike then, i recon that it had 30 relays on the thing. Running What?? the brake light |
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| Author: | Scrawny [ Fri Sep 18, 2009 1:35 pm ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
Mike wrote: steknig wrote: shep wrote: Damo wrote: steve wrote: if there's any chance to run more relays nissvit will find a way, he loves em. I have a similar love of relays. Actually, I love them as much as I hate scotchlocks Relays FTW!!! Waiting for Ford alternator to arrive, then i'll give this a crack you would have liked my bike then, i recon that it had 30 relays on the thing. Running What?? the brake light  Wow!! Where you been hiding Mike??
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| Author: | nissvit [ Sat Sep 19, 2009 12:07 pm ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
Found this pic from another post I put somewhere, but it may be useful if someone is trying to work out which pin on the alt does what... the alts on the sierra's & the vits have the same pin layout.... on the (mitsubishi manufactured) alt fitted to the falcon the pin functions are stamped L (light) & S (sense) in the ally casing beside the connector block. but if you have a chinese copied alternator (off ebay of similiar)there will be no stampings... there were chinese copied alternators for ford probe or Mazda 626 (70 amp ones) on a few sites for while for $89 US, and it looks like these have been brought in and fitted to quite a few vehicles. They are great for use in a zook, but if their reg fails (a rare event) they are just different enough to the mitsubishi that parts are not interchangeable, and a problem to get... bearings in them are the same as the mitsu ones.. |
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| Author: | trity [ Wed Aug 01, 2012 3:07 pm ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
Can someone pls tell me what type of relay to use? Is it a normally open type? Ive tried wiring it in but to no luck still reads 15v |
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| Author: | Rossco [ Wed Aug 01, 2012 3:22 pm ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
yep, if you've wired every thing in correctly and it still gives a high reading to regulator is probably stuffed and you'll need a new one. thats what happened to mine at least. |
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| Author: | trity [ Wed Aug 01, 2012 3:31 pm ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
I ran the sense wire directly to the battery and reads a respectable 14.34v as soon as the relay is put in it instantly jumps to 15.3v so that leads me to maybe the relay |
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| Author: | Reubs [ Wed Aug 01, 2012 4:21 pm ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
trity wrote: I ran the sense wire directly to the battery and reads a respectable 14.34v as soon as the relay is put in it instantly jumps to 15.3v so that leads me to maybe the relay Is the relay connected properly? You can use a n/o 4 or 5 pin or a c/o 5 pin - but if you use a c/o 5 pin ensure you use the correct pins (not pin87a)! Run the original sense/ignition +ve wire (black/white) to pin 85, connect an earth to pin 86, connect a wire from the battery (with a fuse at the battery end) to pin 30, connect alternator 'sense' terminal to pin 87. This runs a fresh wire, fuse & relay to the alternator - removing any voltage drop. I'm not sure about the EL mitsubishi brand alternators but the Bosch one I installed had a 14.4V regulator and there would need to about 1 volt of drop across your wiring, ignition switch, fuse box etc, to the 'sense' terminal to see a 15.3V output at the alternator. |
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| Author: | trity [ Wed Aug 01, 2012 5:00 pm ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
Ok what i have is this Pin 30 direct to battery via fuse Pin 85 to earth Pin 86 to original sense wire Pin 87 to alternator sense terminal The relay used is narva brand 4 pin normally open type 12v 40amp and states pin 30 power in pin 85 earth pin 86 switch and pin 87 power out acc 1 |
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| Author: | trity [ Wed Aug 01, 2012 7:32 pm ] |
| Post subject: | Re: High (15.2V) voltage output from Falcon alt? |
Found the issue a blown fuse was making the reading higher replaced the fuse now all good 14.34v |
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