msd btm pn 5642

[Craving4Boost]

i did search around and i sort of know how to install it i guess but sometimes some of the wires were left out. does any have pictures of the install or good instructions? i know wat to do about the orange/red/white/black....but wat about the purple/green and black/grey?

if anyone can post thanks..or also e-mail me at [email protected]

how good is the tech support if i call?

[Craving4Boost]

oh yeah i forgot to add i have a s13 so i have external coil

[onosqv]

zerothread?id=72633

[Craving4Boost]

cool thanks....does anyone have any pics of their btm installed? i like to have a picture in my head for the peace of mind

[Craving4Boost]

ok it says the purple and green pointy ones are for magnetic pick up?? so it doesnt have to go inside the black and grey wire?? if it does...which goes into which?? also they prove a red wire they gets split into two and a white wire separatley....what am i suppose to do with these? i was never good with electrical common sense lol..

[Craving4Boost]

ok nevermind...the pointy wires do go into the black/grey...but which one goes into which? and the purple/green wires that have the 2 holes are for magnetic pick up? its fine if i just leave it alone?

[onosqv]

ok nevermind...the pointy wires do go into the black/grey...but which one goes into which? and the purple/green wires that have the 2 holes are for magnetic pick up? its fine if i just leave it alone?

from that link I provided,3rd post7th line

[Craving4Boost]

just comfirming thats all......

wat about the 2red wires and white wire that comes separatley? is that for the tach adaptor he was talking about? if so, whats that tach adaptor for?

[Craving4Boost]

and you still didnt tell me which wire goes with it? the grey/black and purple/green....which goes with which?

[Craving4Boost]

sorryyy another question...last one! the coil has 3 wires right? on my 91 s13 i have white, black, green/black....im assuming the black is the negative coil? but which one is the positive? and then the 3rd wire can be left alone?

[Craving4Boost]

wait a minute....are those wires even the ones im suppose to use? lol....

am i suppose to cut open the coil wire and theres a negative and positive wire inside? the wire coming off the distributor with the red tip right lol...

god im such a noob

[Import_Ant]

zerothread?id=129743

I think you'll find the answers there. I know its for rewiring the coil but it shows the color/purposes of the wires.

er scratch that. let me look for a wiring diagram. are you DOHC or SOHC?

[Import_Ant]

sorry about the inability to read I'm reply while I'm at work. bad me, typing while talking to customers but w/e

anyhow here's what you're after:

instruction manual MSD BTM 5462

FSM for 91-94 240sx

there are the links I'm going to be digging through I'll reply when I have the definite wire to wire answer.

[Craving4Boost]

im running DOHC

[Import_Ant]

the plug to your ignition coil should have 3 colors. Black, Light Green/Black, and Black/Red.

the plug you were messing with goes to the transistor. leave that one alone. also on your btm the green and violet wires are to be left un-used.

you'll want to ground the black wire to your vehicle chassis. the red is going to be wired directly to your ign coil WITH the existing positive wire. I'm not sure if that is the black/Red wire or the Light Green/Black wire. Use a volt-meter to find out which is positive and negative. the orange goes to your coil (it's the negative) and the white wire on your BTM gets wired as the 'trigger'. Im not quite sure which wire you're after here I'd sugged Pm'ng WDRacing and find out what wire he used. he's got a BTM wired up and should be able to advise you about this.

[Import_Ant]

meh I went digging through BrokeAs240's link and found the answer. Thanks man

Quote »white-goes to the wire that you take off the neg side of the coilblack and gray are for the control knobgreen and violet are for a magnetic pickup system, not usedI also needed a tach adapter (pn 8910) on my 90' model, so likely you will need it too. It just has two wires that splice in with the red and white wires. [/quote]so in short you're only cutting one wire. you're going to snip the negative wire at your ignition coil and wire it to the white wire on your BTM then connect the orange wire to the negative. the red wire will get wired WITH the positive wire to your coil then black = ground and the other two go to your control knob.

hope that made sense (because I don't know which is pos/neg I cant say you're going to have to test w/ your voltmeter but it is the light Green/Black and Black/Red wires you are going to be testing. 1 is + other is -.

[Craving4Boost]

yeah i know what to do with the wires...however i have 2 green/black and 2black/red wires.....i dont know which one it is

[Import_Ant]

yeah i know what to do with the wires...however i have 2 green/black and 2black/red wires.....i dont know which one it is

you should have two plugs. one with three wires (goes to the transistor) and one with 2 wires and an additional ground wire seperate (goes to ignition coil) You want the plug with the 2 wires going to the ignition coil.

I circled the correct plug in red on the wiring diagram.

[Craving4Boost]

yyessss the answer i was lookin for! i love u man! lol... your such a patient man even though you were working and sh*t..thanks a lot youve made me a happy man

[Import_Ant]

no probs i'm going to be installing mine this weekend so I just got done researching this.

let us know how it turns out, in that last thread there was some general-unhappiness w/ the BTM. I hope yours works well.

[Craving4Boost]

i dont have a voltmeter but someone told me the black/red is positive for their s14 so it should be the same right

[Craving4Boost]

yeah ive heard some bad things about the btm as well. if mines doesnt work out im going to sell it and go with Water injection

[Import_Ant]

i dont have a voltmeter but someone told me the black/red is positive for their s14 so it should be the same right

if it's OBD I (pre '96) it should be.

[Craving4Boost]

i installed my msd btm about a week ago and havent turned my engine on except today. i think i installed it wrong because when the engine turns on it would go up high (because its cold) and then just die out. can hooking up a BTM cause my car not being able to hold idle?

for the orange and white wire....i cut the positive coil wire...i put the WHITE wire connected to the wire that has been dettached...now the ORANGE wire...went directly to the wire that is attached to the CLIP...is this correct or did i have it backwards? which wire goes to the clip..and which wire goes to the wire left hanging

[Craving4Boost]

the only other thing i did within the week was block off the EGR...but im suppose to block off the EGR so i doubt its casuing the problem

[Import_Ant]

ground the black wire to your vehicle chassis.

the red is going to be wired directly to your ign coil WITH the existing positive wire. (black/Red wire)

the orange goes to the negative connection on your coil.

the white wire gets wired directly to the green/black coming from your wiring harness.

so if you're running the stock coil, you want to use a wire tap or solder the red wire to your black/red wire at your ignition coil. Cut the green/black wire at your ignition coil. wire the end to the wiring harness to the white wire on the btm. wire the end going to the plug/ignition coil to the orange wire.

so you basically wired it backwards. you shouldnt cut the black/red wire at all. its the green one (negative) wire you want to be cutting.

[Craving4Boost]

oh no no i MEANT the negative coil wire..oopz...but yeah thats what i did.

but sh*t! the WHITE wire goes to the clip and the orange wire goes to the one left hanging?! dammit!

[Craving4Boost]

aw nevermind i did do it right =/

[Craving4Boost]

orange wire goes to the clip right...and the white wire goes on the other end

[Import_Ant]

orange wire goes to the clip right...and the white wire goes on the other end

correct. white wire should be going to the engine harness portion. the orange wire should be going to the ignition coil itself.

how long does the engine run before it dies? it's possible you might have a disconnected vacuum line or something else. if you want to test, try reconnecting the green/black wire (it'll bypass the BTM) if you still have the problem w/ the car not running I'd start checking your IC piping/vacuum lines.