'86 MJ 2.5L ECM....good?

[SoCalManche]

Just now, eaglescout526 said:

Hmmmmm, well what the pic is from the book is probably what you would see if you tore out the fuse box and were looking at that head on. So my guess is is that some of the prongs on the engine side are probably shared by two smaller clips on the otherside, say if it was a power or ground wire. But that's the only pic the 86 electrical manual gives of C100

Well that's weird because C4 doesn't have a prong for me.

[eaglescout526]

That's exactly why I think it is for the inside view under the dash. But theres no way to find the orange wire to the connector is there?

[SoCalManche]

1 minute ago, eaglescout526 said:

That's exactly why I think it is for the inside view under the dash. But theres no way to find the orange wire to the connector is there?

I mean, the orange wire could be connected to that void? Or no? I honestly have no idea.

 

[eaglescout526]

I honestly have no idea. But it should be one of the few prongs with power when you jump the relay.

[SoCalManche]

9 minutes ago, eaglescout526 said:

I honestly have no idea. But it should be one of the few prongs with power when you jump the relay.

Okay, so for all intents and purposes, let's split C-100 in half as Left and Right.

 

Looking at my connector in the picture, the right connector block's first prong in the upper left corner with be notated as R_1, followed by R_2 next in line, and so on, moving left to right, top to bottom. With that said, R_7 is only one with battery voltage, and R_5 was 0.25V. The only notable occurrences were R_2 and R_4 showing erratic voltage readout, but mostly erratic in mV, so who cares, yeah?

[Ωhm]

Isn't R = A. May have some tar on it.

[SoCalManche]

7 minutes ago, Ωhm said:

Isn't R = A. May have some tar on it.

I was just using that as a simple annotation since I didn't know the proper terminology. 

 

Regardless, I'm assuming the only battery voltage prong is the FP?

[Ωhm]

34 minutes ago, SoCalManche said:

I mean, the orange wire could be connected to that void? Or no? I honestly have no idea.

Follow orange. Can't be too many orange wires at C100. We know it passes through because we have voltage at fuel pump motor.

[Ωhm]

2 minutes ago, SoCalManche said:

Regardless, I'm assuming the only battery voltage prong is the FP?

No. Need to install jumper wire at FP relay again.

[SoCalManche]

Just now, Ωhm said:

No. Need to install jumper wire at FP relay again.

That was with jumper wire installed.

 

Can't trace wires into connector.

[Ωhm]

1 minute ago, SoCalManche said:

Can't trace wires into connector.

I see what you mean.

[SoCalManche]

7 minutes ago, Ωhm said:

I see what you mean.

What else would be showing battery voltage on those prongs besides FP? I'm assuming that one is the FP considering it was jumpered.

[eaglescout526]

I can’t imagine anything else showing voltage. Can’t turn the truck on with that unplugged. 

[Ωhm]

@eaglescout526 Can you look up power distribution 2.5L in that 86 manual. 87 shows C100_D4, C100_D1 & C100_E1 as being HOT AT ALL TIMES.

[eaglescout526]

Yes give me a little bit. 

[SoCalManche]

42 minutes ago, Ωhm said:

@eaglescout526 Can you look up power distribution 2.5L in that 86 manual. 87 shows C100_D4, C100_D1 & C100_E1 as being HOT AT ALL TIMES.

 

14 minutes ago, eaglescout526 said:

Yes give me a little bit. 

 

 

You guys are great!

[eaglescout526]

1 hour ago, Ωhm said:

@eaglescout526 Can you look up power distribution 2.5L in that 86 manual. 87 shows C100_D4, C100_D1 & C100_E1 as being HOT AT ALL TIMES.

Ωhm. These are correct as well for 86.

 

Didn't mean to take that long, out and about.

[SoCalManche]

18 minutes ago, eaglescout526 said:

Ωhm. These are correct as well for 86.

 

Didn't mean to take that long, out and about.

No worries! I will check these!

[eaglescout526]

So including the bypassed relay, 4 should have power. I would not bypass the relay right now and find the 3 that have power so it makes finding the bypassed wire easier.

[SoCalManche]

1 minute ago, eaglescout526 said:

So including the bypassed relay, 4 should have power. I would not bypass the relay right now and find the 3 that have power so it makes finding the bypassed wire easier.

Alright. Now I have to just verify how accurate the diagram is to my connector.

[eaglescout526]

Yeah I would be skeptical on how accurate it is but it'll get figured out.

[SoCalManche]

So three are HOT without jumper. Should I leave the relay out too?

[eaglescout526]

Ok so you found the three that are hot. Now the fourth one shall become hot when you put in the jumper. Leaving the relay in while finding the first three was fine. Once the fourth one is found we need to see how many volts are getting there.

[SoCalManche]

1 minute ago, eaglescout526 said:

Ok so you found the three that are hot. Now the fourth one shall become hot when you put in the jumper. Leaving the relay in while finding the first three was fine. Once the fourth one is found we need to see how many volts are getting there.

Haha, sorry. I was kind of talking out loud about needing to find three. I haven't found that. I just wanted to know if I needed to check with or without relay in socket. And you gave me the answer accidentally! I'll report back briefly.

[eaglescout526]

Yeah whether the relay is in the socket or not, we will still find the three that are hot. No worries about talking out loud, helps one to think.