lights dim under 3500 rmps - 97 dx with ls swap
11-20-2006, 08:57 PM
#1
Honda-Tech Member
Thread Starter
Join Date: Dec 2005
Location: Johnson City, TN
Posts: 153
Likes: 0
Received 0 Likes
on
0 Posts
lights dim under 3500 rmps - 97 dx with ls swap
i tried to reply here (https://honda-tech.com/zerothread?id=838099) but it wouldnt let me for some reason. but I am having the exact same problem. also it is a 97 dx with ls swap obd2a all stock. I just replaced battery and alternator with no luck 
. anyway did anyone ever figure this out? and what two wires or wire do you disconnect / jump at the ecu? or what tells the alternator when to start charging?
Thanks for help. this is really driving me crazy! lol
. anyway did anyone ever figure this out? and what two wires or wire do you disconnect / jump at the ecu? or what tells the alternator when to start charging? Thanks for help. this is really driving me crazy! lol
11-20-2006, 09:21 PM
#2
Member
Join Date: Dec 2005
Location: NY, USA
Posts: 1,137
Likes: 0
Received 0 Likes
on
0 Posts
Re: lights dim under 3500 rmps - 97 dx with ls swap (benphillips)
if the system, electrical system, is under a high load - the lights will do that.
Stock 95 Civic DX..
Blower > 3 Lights dim,
If i turn off my fogs, i get some brightness back...
It is the amount of power that you are drawing, if you really want to fix this - try upgrading the "big 3" - basically main three battery wires, Ground, Power Dist, Alternator...
Stock 95 Civic DX..
Blower > 3 Lights dim,
If i turn off my fogs, i get some brightness back...
It is the amount of power that you are drawing, if you really want to fix this - try upgrading the "big 3" - basically main three battery wires, Ground, Power Dist, Alternator...
11-20-2006, 09:42 PM
#3
Honda-Tech Member
Thread Starter
Join Date: Dec 2005
Location: Johnson City, TN
Posts: 153
Likes: 0
Received 0 Likes
on
0 Posts
yea but this is different. its like the alternator is charging at all until the rmps get above 3500 and then as soon as they go below it stops charging again. Does anyone know if the ALTC wire going to the ecu does. Ive heard you can cut it if your voltage is fluxuating. Guess I'll try tomorrow and see what happens
11-20-2006, 10:17 PM
#4
Member
Join Date: Dec 2005
Location: NY, USA
Posts: 1,137
Likes: 0
Received 0 Likes
on
0 Posts
Re: (benphillips)
if i'm not mistaken, it just "detects" electrical system load - it is supposed to change the idle speed...
ever notice that your engine idles a little higher when your lights/ac on?
if you cut it the ecu might just default to "full-load" mode and bumps up your idle speed. <-I'm not to sure about that, but from what you said it does that is what i think it does.
You could check that fuse in the main fuse block - i think its the voltage regulator fuse or something... i dunno exactly - all i know is that fuse is connected to a device that tells the ecu what the current system draw is... that device could be malfunctioning - but i seriously don't know.
What bulbs are you running? Do you have fogs? High Power Stereo?
ever notice that your engine idles a little higher when your lights/ac on?
if you cut it the ecu might just default to "full-load" mode and bumps up your idle speed. <-I'm not to sure about that, but from what you said it does that is what i think it does.
You could check that fuse in the main fuse block - i think its the voltage regulator fuse or something... i dunno exactly - all i know is that fuse is connected to a device that tells the ecu what the current system draw is... that device could be malfunctioning - but i seriously don't know.
What bulbs are you running? Do you have fogs? High Power Stereo?
11-21-2006, 10:25 PM
#5
Honda-Tech Member
Thread Starter
Join Date: Dec 2005
Location: Johnson City, TN
Posts: 153
Likes: 0
Received 0 Likes
on
0 Posts
well pulled the ALTC pin out of the ecu today and problem solved! Not sure what it does but everything seems to run the same just no more dimming 
Thread
Thread Starter
Forum
Replies
Last Post
Integra2316
Honda Civic / Del Sol (1992 - 2000)
7
11-30-2012 07:55 AM
stopspazinout
Honda Civic / Del Sol (1992 - 2000)
4
05-31-2011 07:21 AM
