zetabird Posted August 27, 2020 Share Posted August 27, 2020 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 Sent from my SM-G973U using Tapatalk Link to comment Share on other sites More sharing options...
jdog Posted August 27, 2020 Share Posted August 27, 2020 looks to be a fuse link that goes to the starter relay, you can see the others betwwen it and the battery Link to comment Share on other sites More sharing options...
87MJTIM Posted August 27, 2020 Share Posted August 27, 2020 Radiator fan relay? Link to comment Share on other sites More sharing options...
zetabird Posted August 27, 2020 Author Share Posted August 27, 2020 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 Link to comment Share on other sites More sharing options...
Ωhm Posted August 27, 2020 Share Posted August 27, 2020 Could be FL for B+ Latch Relay. On start up does vehicle idle soar and come down after CRANK? Link to comment Share on other sites More sharing options...
zetabird Posted August 27, 2020 Author Share Posted August 27, 2020 sometimes... mabey kinda the thing has never started quickly or idled well on startup.... Link to comment Share on other sites More sharing options...
Ωhm Posted August 27, 2020 Share Posted August 27, 2020 With engine RUNNING, does D2_5 show B+ (battery) voltage? Link to comment Share on other sites More sharing options...
zetabird Posted August 27, 2020 Author Share Posted August 27, 2020 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?? Link to comment Share on other sites More sharing options...
zetabird Posted August 27, 2020 Author Share Posted August 27, 2020 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... Link to comment Share on other sites More sharing options...
Ωhm Posted August 27, 2020 Share Posted August 27, 2020 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. Link to comment Share on other sites More sharing options...
zetabird Posted August 27, 2020 Author Share Posted August 27, 2020 will do ill let you know how it tests Link to comment Share on other sites More sharing options...
zetabird Posted August 27, 2020 Author Share Posted August 27, 2020 thats the two connectors with yellow caps by the coolent tank right? Link to comment Share on other sites More sharing options...
Ωhm Posted August 27, 2020 Share Posted August 27, 2020 1 minute ago, zetabird said: thats the two connectors with yellow caps by the coolent tank right? Yes Link to comment Share on other sites More sharing options...
zetabird Posted August 27, 2020 Author Share Posted August 27, 2020 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 Link to comment Share on other sites More sharing options...
Ωhm Posted August 27, 2020 Share Posted August 27, 2020 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. Link to comment Share on other sites More sharing options...
zetabird Posted August 27, 2020 Author Share Posted August 27, 2020 Really? I thought it had 3... ground to block head to firewall and batt to fenderSent from my SM-G973U using Tapatalk Link to comment Share on other sites More sharing options...
Ωhm Posted August 27, 2020 Share Posted August 27, 2020 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. Link to comment Share on other sites More sharing options...
zetabird Posted August 27, 2020 Author Share Posted August 27, 2020 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 Link to comment Share on other sites More sharing options...
zetabird Posted September 1, 2020 Author Share Posted September 1, 2020 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 outSent from my SM-G973U using Tapatalk Link to comment Share on other sites More sharing options...
zetabird Posted September 1, 2020 Author Share Posted September 1, 2020 Looks like everything I'm seeing showed 4 ring terminals with fuseble links on that post . One blueOne two green wiresOne orange and green wiresAnd one single orange wire like my unhooked oneSent from my SM-G973U using Tapatalk Link to comment Share on other sites More sharing options...
Ωhm Posted September 1, 2020 Share Posted September 1, 2020 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? Link to comment Share on other sites More sharing options...
zetabird Posted September 1, 2020 Author Share Posted September 1, 2020 Nope with the wire unhooked the teminal in the testport had power i tested the loose wire it also had powerSent from my SM-G973U using Tapatalk Link to comment Share on other sites More sharing options...
Ωhm Posted September 1, 2020 Share Posted September 1, 2020 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? Link to comment Share on other sites More sharing options...
zetabird Posted September 1, 2020 Author Share Posted September 1, 2020 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 thoSent from my SM-G973U using Tapatalk Link to comment Share on other sites More sharing options...
Ωhm Posted September 1, 2020 Share Posted September 1, 2020 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. Link to comment Share on other sites More sharing options...
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