Loose wire by battery

[zetabird]

So I'm building new cables for my 88 and while i was digging wires and repairs the PO hacked in i found this wire unhooked lqying under the battery.... what is it

 

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[jdog]

looks to be a fuse link that goes to the starter relay, you can see the others betwwen it and the battery

[87MJTIM]

Radiator fan relay?

 

[zetabird]

it goes down into the wire loom that runs along the fender i didnt want to unloom it all to try to trace it just yet, ive had this truck prolly 6 years and its never been hooked up, i also don't think i have an electric fan i can't remember

[Ωhm]

Could be FL for B+ Latch Relay. On start up does vehicle idle soar and come down after CRANK?

[zetabird]

sometimes... mabey kinda the thing has never started quickly or idled well on startup.... 

[Ωhm]

With engine RUNNING, does D2_5 show B+ (battery) voltage?

 

[zetabird]

its a fused link so I'm guessing it needs to be hooked to a positive somewhere. it reaches the starter relay should i hook it there??

[zetabird]

Just now, Ωhm said:

With engine RUNNING, does D2_5 show B+ (battery) voltage?

 

ill have to check once i get all the cables back on... 

[Ωhm]

2 minutes ago, zetabird said:

its a fused link so I'm guessing it needs to be hooked to a positive somewhere.

Yes. At the Starter Relay Bolt.

2 minutes ago, zetabird said:

it reaches the starter relay should i hook it there??

Wait. Do D2_5 test first.

[zetabird]

will do ill let you know how it tests

[zetabird]

thats the two connectors with yellow caps by the coolent tank right?

[Ωhm]

1 minute ago, zetabird said:

thats the two connectors with yellow caps by the coolent tank right?

Yes

[zetabird]

ive got to get the grount to block nut off the stupid stud, then make the new batt to starter and starter relay to batt cable. also it should have a ground fromthe battery to the fender right? mine dosent and there is nothing on the fender that looks like it ever had one

[Ωhm]

10 minutes ago, zetabird said:

also it should have a ground fromthe battery to the fender right? mine dosent and there is nothing on the fender that looks like it ever had one

Only ground should be B- negative to engine block.

[zetabird]

Really? I thought it had 3... ground to block head to firewall and batt to fender

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[Ωhm]

I was only talking battery. True. block head to firewall. I don't believe factory came with B- negative to fender. Could be wrong here.

[zetabird]

no problem I'm going through cruisers site and he says to add one from the batt - to the core support and re do the head to firewall... pretty sure that ones missing on mine

[zetabird]

Ok so got my new cables in. The pin has batt+ when running. But i tested that wire and it also has positive voltage when the truxks running I'm suprised it hasent shorted out

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[zetabird]

Looks like everything I'm seeing showed 4 ring terminals with fuseble links on that post .
One blue
One two green wires
One orange and green wires
And one single orange wire like my unhooked one

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[Ωhm]

Of all the relays used on these vehicle, B+ Latch relay is the strange one. When you tested for voltage on D2_5 with engine running was the fuse link hooked up to the starter relay?

[zetabird]

Nope with the wire unhooked the teminal in the testport had power i tested the loose wire it also had power

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[Ωhm]

1 minute ago, zetabird said:

Nope with the wire unhooked the teminal in the testport had power i tested the loose wire it also had power

Okay, that proves the ECU C202_B10 supplied the 12vdc (B+) for D2_5 and B+ Latch relay was picked (activated) by the ECU C202_A9. Using a fused jumper wire connect the FL eyelet to B+ (battery). START engine, does Idle Air Control (IAC) motor help with engine IDLE?

[zetabird]

It dose idle better. Reves high at first for a second or two then smothes out. I did find some bad hoses on the charcoal canister tho

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[Ωhm]

B+ Latch relay uses that FL link to supply B+ (battery) voltage for IAC motor drivers (on ECU). Also resets IAC during KEY OFF for next START.