FJ62 88 Shorted and Ignition Switch Issue (1 Viewer)

[ItsUncleCruiser]

I recently acquired a short when swapping batteries on my 88 FJ62, and fried a few wires coming from the positive post of the battery. Since then it has not started up. Dumb mistake.


First thing to note is that my IG fuse (7.5A) will blow after turning the key in the ignition switch to the “run” position. This is before starting the engine, and if I try it will crank.


I made a new splice on the yellow wire that was damaged, and it didn’t have a fusible link. Currently I have narrowed down to the black wire “AM 1” leading into a fusible link shows little resistance to the chassis/negative when the IG SW is in “ACC”, and complete continuity when in “Run”. All other wires don’t show any resistance in either state.

 

[ItsUncleCruiser]

Now, when the IS is in “Off” the following pins show continuity:


IG1 (blk-yel/pin2)/IG2 (brn-wht/pin?)/ST1 (blk-wht/pin 1)


When in “ACC”:


IG1/IG2/ST1 with each other


and


AM1 (blk-red/pin3)/AM2 (brn/pin4)/ACC (blu-red/pin3) with each other


When in “Run”:


IG1/IG2/ST1/AM1/AM2/ACC


Only ST2 (brn-red/pin?) is not connected in any state. I am unsure which pin #’s are 7 and 8, and what the 7th wire is. Anyone know?

Do you know if ST is for starter and AM is for alternator?


Worried that the IS is either defective now, possibly finding the one short from the battery would resolve this issue since IG1/IG2/ST1 shouldn’t have continuity at any state with each other.

 

[ItsUncleCruiser]

It doesn’t end there, I found a fusible link possibly burnt coming off the alternator that was also connected to the wire that was scorched from the battery.

At least I’m enjoying myself with this. If anyone has any tips and hints please share. I would greatly appreciate it!


I will try not to make to many mistakes in the meantime.


Thanks

 

[ItsUncleCruiser]

I recently acquired a short when swapping batteries on my 88 FJ62, and fried a few wires coming from the positive post of the battery. Since then it has not started up. Dumb mistake.


First thing to note is that my IG fuse (7.5A) will blow after turning the key in the ignition switch to the “run” position. This is before starting the engine, and if I try it will crank.


I made a new splice on the yellow wire that was damaged, and it didn’t have a fusible link. Currently I have narrowed down to the black wire “AM 1” leading into a fusible link shows little resistance to the chassis/negative when the IG SW is in “ACC”, and complete continuity when in “Run”. All other wires don’t show any resistance in either state.

*correction white wire has a new splice not the yellow.

 

[workingdog]

Did you ever figure this all out?

I think my switch is dead and I'm trying to figure it out.

 

[ward93]

Im having a similar issue. Im assuming i just need to replace the ignition module in the collum

 

[morganism]

check this connector behind dash cluster too, there are 5 screws holding gauges in..

Is my alternator about to eat dust?