Looking for assistance with my 88 XR
Looking for assistance with my 88 XR
Hi so this is an 88 xr automatic transmission. Car has been sitting on and off. Last Wednesday i started it up, first crank and it ran. It ran for 10 mins, checked blower fan, checked other accessories and drove as well. I changed the oil and Noticed one of the fisible links on the starter solenoid were broken so i replaced it with a fuse link from the parts store, and added a 15 amp fuse.
Installed it and with the key turned to the accessories;the fuse popped. Put all of the accessories to off and same thing. Checked other fuses and relays- headlight fuse and tachometer were blown also- replaced those as well. Replaced the 15 amp fuse on the start solenoid to a 20 and fuse blew up and smoke entered the passenger side of the car. After that i Checked all fuses in engine bay (all ok, none blown) and checked relays on passenger side and ecu ( all look to be ok, even checked the board on the ecu and nothing is blown up).
I dont see any wiring thats cut, im checking the ignition lock solenoid but cant find any diagrams on it.
Any helpful suggestions? The blower fan i replaced with a good spare one; im getting a 12 ohm resistance on the motor compared to 1 ohm on the original one.
Thanks
Installed it and with the key turned to the accessories;the fuse popped. Put all of the accessories to off and same thing. Checked other fuses and relays- headlight fuse and tachometer were blown also- replaced those as well. Replaced the 15 amp fuse on the start solenoid to a 20 and fuse blew up and smoke entered the passenger side of the car. After that i Checked all fuses in engine bay (all ok, none blown) and checked relays on passenger side and ecu ( all look to be ok, even checked the board on the ecu and nothing is blown up).
I dont see any wiring thats cut, im checking the ignition lock solenoid but cant find any diagrams on it.
Any helpful suggestions? The blower fan i replaced with a good spare one; im getting a 12 ohm resistance on the motor compared to 1 ohm on the original one.
Thanks
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Re: Looking for assistance with my 88 XR
If things were working... why did you mess with the fusible link?
Re: Looking for assistance with my 88 XR
Hi all,
A fusible link is a default fuse in and of itself. Did you replace it with the same size version of wire? Or is this a little pig tail with a fuse holder molded into it? If it is actually a real fusible link it will fail when you exceed its' rating. No other fuse required. If it is a fuse holder, what are you providing power to with that connection? If it is the starter main power then it will want a lot more than 20 amps. I don't know the demand current for the starter; anyone in here have that rating?
Cheers
A fusible link is a default fuse in and of itself. Did you replace it with the same size version of wire? Or is this a little pig tail with a fuse holder molded into it? If it is actually a real fusible link it will fail when you exceed its' rating. No other fuse required. If it is a fuse holder, what are you providing power to with that connection? If it is the starter main power then it will want a lot more than 20 amps. I don't know the demand current for the starter; anyone in here have that rating?
Cheers
1986 XR4Ti Mineral Blue Metallic
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Re: Looking for assistance with my 88 XR
Starter solenoid gets a low power signal via small black wire from ignition switch which closes solenoid internal contacts allowing high amp power flow to the starter motor.
YMMV
YMMV
Descartes: "Cogito Ergo Sum"
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Re: Looking for assistance with my 88 XR
When i did the oil change i noticed the fusible link was barely holding on. Everything was corroded.thesameguy wrote: ↑Tue Apr 07, 2020 12:30 am If things were working... why did you mess with the fusible link?
Re: Looking for assistance with my 88 XR
The fusible link on it showed 14g on the green tab but no amps on it, so i just put a 15amp in it. The wire with the fuse is a 14g wire.
I noticed the fusible link was broken when i did the oil change, the insulation was completely gone off the wire.
I noticed the fusible link was broken when i did the oil change, the insulation was completely gone off the wire.
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Re: Looking for assistance with my 88 XR
That's not how fusible links work. Blade type fuses are rated in amps, but fusible links are rated by the size of wire they protect... there isnt a "wire size to amp" conversion that can directly be done. An engineer spec'd that link based on things you may not be able to infer.
A fusible link labeled 14g means it's designed to protect a 10 gauge wire. 10 gauge wire can support up to 55 amps constantly, and quite a bit more in short bursts. For example, battery cables are typically 1ga or 2ga, which is 210a or 180a respectively, but they might handle double that to run a starter.... just in very short bursts. This could also be something like inrush current for a fan, etc.
Without knowing the characteristics of the thing(s) being protected, I think you would be reasonably safe using 10ga wire with a 60a fuse in the middle to approximate that 14g fusible link. However, this is an internet guess. You might find whatever is at the other end has an inrush that will exceed that 60a rating.
Where does that fusible link go? It's not "for" the solenoid, it's from the battery (via the solenoid) to something else.... do you know what?
A fusible link labeled 14g means it's designed to protect a 10 gauge wire. 10 gauge wire can support up to 55 amps constantly, and quite a bit more in short bursts. For example, battery cables are typically 1ga or 2ga, which is 210a or 180a respectively, but they might handle double that to run a starter.... just in very short bursts. This could also be something like inrush current for a fan, etc.
Without knowing the characteristics of the thing(s) being protected, I think you would be reasonably safe using 10ga wire with a 60a fuse in the middle to approximate that 14g fusible link. However, this is an internet guess. You might find whatever is at the other end has an inrush that will exceed that 60a rating.
Where does that fusible link go? It's not "for" the solenoid, it's from the battery (via the solenoid) to something else.... do you know what?
Last edited by thesameguy on Tue Apr 07, 2020 6:14 pm, edited 1 time in total.
Re: Looking for assistance with my 88 XR
Hi all,
A fusible link wire can be bought at car parts stores usually. Standard Motor Products (Blue Streak maker) have a 10 foot long wire for that in a little pack with part number HP2730 and it is rated for 14 gauge wire. It should be less than $5.00 in the help section for little connectors and such items. Cut to length as needed, obviously.
I looked up a remanufactured starter for the car out of curiosity and it is rated 1.2 kW for our Lima motor. That is like the original starter design. The permanent magnet one some use will probably have a different rating.
Cheers
A fusible link wire can be bought at car parts stores usually. Standard Motor Products (Blue Streak maker) have a 10 foot long wire for that in a little pack with part number HP2730 and it is rated for 14 gauge wire. It should be less than $5.00 in the help section for little connectors and such items. Cut to length as needed, obviously.
I looked up a remanufactured starter for the car out of curiosity and it is rated 1.2 kW for our Lima motor. That is like the original starter design. The permanent magnet one some use will probably have a different rating.
Cheers
1986 XR4Ti Mineral Blue Metallic
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Re: Looking for assistance with my 88 XR
Yes, and this is by far and away the safe approach however fusible links must be properly installed in order to perform as expected.zxr250cc wrote: ↑Tue Apr 07, 2020 5:43 pm Hi all,
A fusible link wire can be bought at car parts stores usually. Standard Motor Products (Blue Streak maker) have a 10 foot long wire for that in a little pack with part number HP2730 and it is rated for 14 gauge wire. It should be less than $5.00 in the help section for little connectors and such items. Cut to length as needed, obviously.
You can do some SERIOUS damage to your car by make haphazard electrical modifications. I would not go offroading here unless you know precisely what you're doing. "Fuse popped and smoke filled the car" is not that far away from a fire.
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Re: Looking for assistance with my 88 XR
You noted smoke from the dash.
Check your cigarette lighter(s); they're the mostly likely source of potential high ampere draws other than shorts to ground somewhere in the harness.
YMMV
Check your cigarette lighter(s); they're the mostly likely source of potential high ampere draws other than shorts to ground somewhere in the harness.
YMMV
Descartes: "Cogito Ergo Sum"
Lijewski: "Sum Ergo Drive-O. Mucho!
Lijewski: "Sum Ergo Drive-O. Mucho!
Re: Looking for assistance with my 88 XR
I strongly suggest NOT to replace a “fusible link” with a fuse. They have 2 different uses. The fuse will blow with a spike in current, but allow a low current flow that can destroy your wiring. A fusible link allows spikes [AC Compressor startup]. It’s 4 ga smaller than wire it protects, That’s why it melts before the circuit’s wire. Fusible wire size is based on wire size it’s protecting, not on amps.
All fusible links are on + circuits. XR has 4, Scorpio has 2. When replacing, use same length of fusible link wire as OEM and 4 ga smaller than the circuit’s wire. [Ex 12 ga fusible link for 8 ga circuit wire].
All fusible links are on + circuits. XR has 4, Scorpio has 2. When replacing, use same length of fusible link wire as OEM and 4 ga smaller than the circuit’s wire. [Ex 12 ga fusible link for 8 ga circuit wire].
Last edited by Bob Weir on Thu Apr 16, 2020 1:54 pm, edited 1 time in total.
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Re: Looking for assistance with my 88 XR
Pretty sure XR has two fusible links (not 4).
YMMV
YMMV
Descartes: "Cogito Ergo Sum"
Lijewski: "Sum Ergo Drive-O. Mucho!
Lijewski: "Sum Ergo Drive-O. Mucho!
Re: Looking for assistance with my 88 XR
4 on this diagram. Maybe not 4 on all XR's
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Re: Looking for assistance with my 88 XR
Guessing we are talking about Fuse Link B based the clues dropped.
A 20a fuse is definitely not gonna be sufficient there, and no ATC or ATM fuse would be a valid substitute for that circuit. The easy/correct option is another 14ga fusible link. An alternative would be something like a 60a maxi fuse, either blade or fmx style. It might need a higher amp rating, but as it's basically the supply for the whole car on 10ga wire, 60a seems in the ballpark.
A 20a fuse is definitely not gonna be sufficient there, and no ATC or ATM fuse would be a valid substitute for that circuit. The easy/correct option is another 14ga fusible link. An alternative would be something like a 60a maxi fuse, either blade or fmx style. It might need a higher amp rating, but as it's basically the supply for the whole car on 10ga wire, 60a seems in the ballpark.
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Re: Looking for assistance with my 88 XR
Thanks Bob:
I totally forgot about the two fan power circuits' fusible links. Mea culpa.
YMMV
I totally forgot about the two fan power circuits' fusible links. Mea culpa.
YMMV
Descartes: "Cogito Ergo Sum"
Lijewski: "Sum Ergo Drive-O. Mucho!
Lijewski: "Sum Ergo Drive-O. Mucho!