First off I would like to say that the rywire harness is not very good for 3rd gen preludes, they give no instructions for all these extra wires and it leaves you in the ahhhh fuck mode.
the brown/white(service check signal) wire, Rywire says to connect to b5 brown on the EF chassis
question #1. B5 or Brown wire on the 88-89 preludes is one of the wires for the jumper plug for setting the ignition timing, is this the same as the service check signal wire on the EF.
question #2. there is a pin missing on the rywire harness, the missing pin is supposed to connect White/green wire on the prelude fender harness, any clues on what this is for
First off I would like to say that the rywire harness is not very good for 3rd gen preludes, they give no instructions for all these extra wires and it leaves you in the ahhhh fuck mode.
the brown/white(service check signal) wire, Rywire says to connect to b5 brown on the EF chassis
question #1. B5 or Brown wire on the 88-89 preludes is one of the wires for the jumper plug for setting the ignition timing, is this the same as the service check signal wire on the EF.
question #2. there is a pin missing on the rywire harness, the missing pin is supposed to connect Yellow/red wire on the prelude fender harness, any clues on what this is for
I am not asking about the red arrows(AC relay's) or the blue arrows(Radiator fan & sensor) just the green arrow.
Rywire H22 harness connections are made for Internal coil distributors. External coils are a custom option and cost more. I have a JDM internal dizzy
the Clean white connector on the 2nd pic connects to the plug that the green arrow is pointing too, but the white plug is missing one wire,
on the Green arrow plug that wire is Yellow/red, I do remember musturdcat posting about that one wire but he did not say where that Yellow/red leads too.
the white connector does not plug into the ignitor
The green arrow is the OEM chassis to primary fuse box plug, this is where the Rywire chassis adapter plugs in. This plug connects ecu power, ecu ground, and so forth.
Rywire separated out the charge wires from thier chassis adapter which is the missing pin.
The missing pin you speak of is the hot (charge) wire from the alternator to the battery.
They offer a package with alternator and starter hot wires also, separating the alternator hot wire will reduce/isolate electronic noise and as a result it is not integrated, also since this harness is intended to be tucked it is ideal to seperate out the alternator charge wire.
Run alt charge wire separate to the harness from the fuse box to the alternator...this is what Rywire intends for you to do.
*Don't panic, once you get it setup you'll see it is actually quite simple and removes a lot of redundant oem wiring.*
Note: Mustardcat had to ground his main relay (90-91). I did not have to do this (88-89). Doing so in my case actually kicks on the fuel pump, I'm not sure why he needed to do this, but I didn't.
Here is the image he supplied =>
The green arrow is the OEM chassis to primary fuse box plug, this is where the Rywire chassis adapter plugs in. This plug connects ecu power, ecu ground, and so forth.
Rywire separated out the charge wires from thier chassis adapter which is the missing pin.
The missing pin you speak of is the hot (charge) wire from the alternator to the battery.
They offer a package with alternator and starter hot wires also, separating the alternator hot wire will reduce/isolate electronic noise and as a result it is not integrated, also since this harness is intended to be tucked it is ideal to seperate out the alternator charge wire.
Run alt charge wire separate to the harness from the fuse box to the alternator...this is what Rywire intends for you to do.
First off I made the mistake of Identifying that missing wire as Yellow/red when its White/green. I will edit my first post
that being said, I understand that the missing wire is soppesed to be connected to the green plug which connects to the ALT/voltage regulator on the b20 ALT, if rywire removed this how do you regulate the voltage? is the voltage regulator eliminated on the green plug for JDM H22's or is the Voltage R. connected to the ALT main power terminal on the H.
rev rage
i hear you, i had the worst experience in my 49 years of products i bought.
a total waist of time over 1 1/2 years to get it right in my 91 with a h22a
Question 1: Rywire BRN/WHT does indeed go to B5 (BRN) on your OBD0 harness. SCS and jumper plug are the same thing.
Question 2: With the rywire harness you have to run two separate wires from the alt to the fuse box area:
First one is the larger wire that attaches to the stud on the alt, this wire runs directly into the fusebox. (I just cut this one out of the useless JDM harness that came with my H22.)
Second, you will see that the green alt plug on the rywire harness is missing one wire. You add this and run it to the missing pin in this plug:
This is simply the wire for the charge warning light and is technically not required, but if you don't add it your charge warning light will be on.
Question 1: Rywire BRN/WHT does indeed go to B5 (BRN) on your OBD0 harness. SCS and jumper plug are the same thing.
Question 2: With the rywire harness you have to run two separate wires from the alt to the fuse box area:
First one is the larger wire that attaches to the stud on the alt, this wire runs directly into the fusebox. (I just cut this one out of the useless JDM harness that came with my H22.)
Second, you will see that the green alt plug on the rywire harness is missing one wire. You add this and run it to the missing pin in this plug:
This is simply the wire for the charge warning light and is technically not required, but if you don't add it your charge warning light will be on.
Thanks for clearing up question #1, I wasn't sure cause I have never heard of it being called SCS before, I always called it the jumper plug.
Ok here are some pics of the green plug from the, H22, b20a5 and Rywire harness.
This is the ALT plug from my JDM harness, it does have all 4 wires just like the b20 and like the b20 harness all the wires match in color
Here's a picture of the B20 ALT plug
here's the rywire harness ALT plug
as you can see the WHT/GRN wire is missing.
Here's the factory manual for the b20 showing that the WHT/GRN wire runs from the voltage regulater to the underhood fuse panel
H22 diagram showing the same thing
So why is this wiring missing, why did rywire not include this into there harness
The only thing I can think of at this point is the other wires are regulating the voltage.
Heres the issue of the rywire harness regarding the resistor box.
Heres a pic of musturdcats Rywire harness and resister box, notice his has the grey plug and is hooked up to the JDM box
Heres a pic of my rywire Harness. B20a5 R-box is on the left, JDM r-box on the right, but why does my harness have the plug for the b20a5 R-box and not the JDM. I contacted Rywire and they said it would work. I am not to familiar on how R-boxes but I think JDM injectors and 3rd gen injectors are both low Independence correct?
so I contacted rywire ans asked why is the White/green voltage regulator wire missing from the Green ALT plug, I cross referenced the B20a5 and H22 stock harness and both have that wire.
there response was Ya thats correct, we dont use it. thanks
I was doing a final check of the engine before I hooked up the s300 and came across another rywire issue. Looking at the labels for the wiring and noticed that I had the IACV plug connected to the IAT sensor, the IACV connector had longer wires then the IAC connector so I assumed that the longer wire was supposed to connect to the IAT sensor. So now I tried to switch the connectors to the right position but there is not enough slack in the wiring and will cause tension with the other connectors, like the water sensors. So now I starting to think that rywire either didn't make the wires long enough, or labeled them wrong so now I have to pull out the multimeter and check for continuity with the ecu plugs.
If anyone is planning on getting a rywire harness I would strongly advise not buying one, first they have a missing voltage regulator wire, and now I have to deal with IAT/IACV connectors. I know its not that hard to extend the wires or check for continuity, but when a customer spends 750$ on a harness they shouldn't have to worry about simple problems like this. I also just read that 4wsRyan(aka Blahblah311) has to have is harness sent back to rywire, not sure if this is rywire's fault but it sounds like they messed up on his connectors
I was able to maneuver the the wiring enough to connect the IAT, it still is really tight and it most likely cause problems in the future but I will extend the wire a little and everything should be ok. I also checked the connector with the ECU pin and they were labeled correct.
can't remember and not 100% sure but the blue or blu/wht wire is the signal wire for the MPH gauges in the 90-91. It connects to the tranny speed sensor.
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