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#1
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Re: Alternator Wiring Mod
Trevor... can you explain how running another wire from your alternator to your battery unfused could be dangerous?
Later, Matt. |
#2
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Re: Re: Alternator Wiring Mod
Quote:
__________________
Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#3
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What if you just put a big inline fuse on that new wire?
- Rob |
#4
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Quote:
The fuse obviously should be as close to the battery as possible.
__________________
Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#5
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But of course.
- Rob |
#6
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Trevor
Remember that I am still waiting for your PM about this for the How-To.
__________________
. Earl .... ... .... ><SVX(*> Subaru Ambassador [COLOR=”silver”]1992 Tri Color L[/COLOR] ~45K (06/91) #2430 1992 Dark Teal LS-L ~184K (05/91) #0739 1992 Claret LS-L ~196K (05/91) #0831 1992 Pearl LS-L ~103K (06/91) #1680 1992 Pearl LS-L ~151K (06/91) #2229 1992 Dark Teal LS ~150K (07/91) #3098 (parts car) 1992 White LS-L ~139K (08/92) #6913 1993 25th AE ~98K (02/93) #164 1993 25th AE ~58K (02/93) #176 1993 25th AE ~107K (02/93) #215 1993 25th AE ~162K (02/93) #223 1994 Laguna Blue Pearl LSi ~124K (1/94) #2408 1994 Laguna Blue Pearl LSi ~144K (10/93) #1484 1994 Laguna Blue Pearl LSi ~68K (10/93) #1525 1994 Barcelona Red LSi ~46K (02/94) #2624 1994 Pearl LSi ~41K (12/93) #1961 1995 Bordeaux Pearl LSi ~70K (02/95) #855 1996 Polo Green LSi ~95K (03/96) #872 1997 Bordeaux Pearl LSi ~55K (08/96) #097 2003 Brilliant Red LS1 Convertible ~29K (04/03) #8951 1999 Magnetic Red LS1 Coupe ~33K (04/99) #6420 My Email | Old Locker | New Locker | Picture of 15 of the 19 |
#7
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Quote:
Do you have any Grey Poupon?
__________________
Randy Johnson 3rd Registered Member 02-21-2001 First Member to Reach 10,000 Posts First to arrive at the very first Reading Meet Subaru Ambassador 1992 SVX PPG Pace Car Replica 110+k 1993 White Impreza L 240+K miles 2001 Legacy Outback Limited Sedan 250+K miles 2013 Deep Indigo Pearl Legacy 3.6R 49+K miles "Reading is my favorite Holiday" Mike Davis -- at Reading VI |
#8
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Quote:
" Re: alt upgrade question Hi again Earl, I have had a look in the how to documents but have not been able to find anything on the alternator up grade thing. I was sure I had seen references to it being in there but no sign of it as far as I can see. Have a look and get back to me. While I am at it how can one remove a document which no longer is of interest ? " I hope something has not gone haywire with what has been such a reliable site.
__________________
Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#9
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Thanks Trevor. I have been busy lately. If you let me know what document you want removed, I can do that for you.
__________________
. Earl .... ... .... ><SVX(*> Subaru Ambassador [COLOR=”silver”]1992 Tri Color L[/COLOR] ~45K (06/91) #2430 1992 Dark Teal LS-L ~184K (05/91) #0739 1992 Claret LS-L ~196K (05/91) #0831 1992 Pearl LS-L ~103K (06/91) #1680 1992 Pearl LS-L ~151K (06/91) #2229 1992 Dark Teal LS ~150K (07/91) #3098 (parts car) 1992 White LS-L ~139K (08/92) #6913 1993 25th AE ~98K (02/93) #164 1993 25th AE ~58K (02/93) #176 1993 25th AE ~107K (02/93) #215 1993 25th AE ~162K (02/93) #223 1994 Laguna Blue Pearl LSi ~124K (1/94) #2408 1994 Laguna Blue Pearl LSi ~144K (10/93) #1484 1994 Laguna Blue Pearl LSi ~68K (10/93) #1525 1994 Barcelona Red LSi ~46K (02/94) #2624 1994 Pearl LSi ~41K (12/93) #1961 1995 Bordeaux Pearl LSi ~70K (02/95) #855 1996 Polo Green LSi ~95K (03/96) #872 1997 Bordeaux Pearl LSi ~55K (08/96) #097 2003 Brilliant Red LS1 Convertible ~29K (04/03) #8951 1999 Magnetic Red LS1 Coupe ~33K (04/99) #6420 My Email | Old Locker | New Locker | Picture of 15 of the 19 |
#10
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Hi Earl,
It is some stuff in my locker I wish to delete in actual fact. Sorry for the confusion. It covers some stuff on the shift kit which is no longer valid.
__________________
Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#11
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So what wire and fuse should i use for alt. upgrade?
also if anyone knows what voltage should i get at idle on alternator, at 2000rpms and at 4000rpms... could be nice to check that. cheers Sergi |
#12
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For a standard alternator a 125 amp fuse should be OK. Maximum output is 95 amps.
Voltage will be regulated according the level of charge in the battery and the load. You should have 13.4 volts or more at the battery when above say 1500 RPM.
__________________
Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#13
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so what kinda wire will do?
gauge 8, 4? |
#14
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Sergi,
Why do you think you should do it ? For your information I repeat a previous post. Quote. ------ Please be clear that I do not wish to be involved in an argument but if the original wiring is in good condition there should be no problem. It must be appreciated that the alternator wiring mod as originally suggested by passes all alternator over current protection as is incorporated in the original set up for very good reason,. In the event of a front end prang and a short circuit at the alternator you could end up with an engine compartment fire as this circuit is capable of passing a very high fault current. If your insurerŐs assessors are on the ball you will be out of luck in a big way should you make a claim. I have checked the original alternator wiring on my car and have taken measurements as follows, using two high class digital instruments in parallel, as confirmation the accuracy of calibration. 1. Voltage dropped alternator + to battery + with dead flat battery and all lights and accessories drawing current, engine at 4500 rpm. --- 0.5 volts. 2. As above but with a fully charged battery (measured at 12.6 volts no load), --- 0.4 volts. 3. As 2, but with only engine electrics drawing current. -- 0.2 volts 4. As 1 above, but alternator frame to battery negative --- 0.13 volts 5. As 2 above, but alternator frame to battery negative --- 0.11 volts 6. As 3 above, but alternator frame to battery negative --- 0.08 volts From the above the total voltage drop in the alternator to battery circuits can be summarised as --- a, Conditions as 1 above, --- 0.63 volts b. Conditions as 2 above, --- 0.51 volts c. Conditions as 3 above, --- o.28 volts Charging current based on the above can be calculated as follows --- a. 0.63v / 0,008 = 78 Amps b. 0.51v / 0,008 = 63 Amps c. 0.28v / 0.008 = 35 Amps I regard the above measurements as indicating that the charging system on my car i.e. OEM is working perfectly and this is born out by three trouble free years in my hands plus no indication of any repairs while in the hands of Japanese owners. It goes without saying that I will not be messing with it. If I do have trouble in the future I will be looking for the cause rather than by passing a fault. Making modifications is not the way to fix Ň crap connections Ň in the charging system. There is an advantage in having a small resistance between the alternator and the battery as this can be a form of over current protection for the alternator. What is more any such small voltage drop will not effect the alternator output voltage as the electronic regulator senses battery voltage directly via a separate pilot wire. My typing is too slow and arduous to explain this in detail but it is in fact illustrated within the above figures. It could be that Subaru designers had this in mind as I can not accept that they were trying to save on a few strands of copper or were ignorant in respect of basic Ohm's law. Take it or leave it, I have no further comment. I am trying to be helpful rather than controversial. If you are running a special alternator capable of delivering increased current you are in a different ball park, but you should think very seriously about the need to incorporate suitable fuse link. ---------------------------------------- Make up your own mind. Wire here is metric. Use the largest cross section you think will be mechanically suitable.
__________________
Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
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