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Electrical Gemlin

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Old 07-10-2018, 07:02 AM
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Electrical Gemlin

suddenly I ran into trouble with my 93 22re truck.

First the em2 fuse link blew leaving me stopped. Replaced fuse drove a couple days no problem. Then the headlights started flickering. Then the next day the truck wouldnít start. Battery gauge showed 8v. Replaced battery, started fine, was charging at 14v. Then driving to work it started overcharging up to 14.5v and the tachometer was behaving erratic. This lasted about 10 seconds. Then the truck died no battery power to vehicle. Towed home. New battery still reads 12v on volt meter. There does not appear to be any blown fuses currently.

Any ideas?
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Old 07-10-2018, 03:31 PM
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Originally Posted by the171 View Post
...it started overcharging up to 14.5v ...
14.5 is not overcharging (search "how charging system works")
Got multi-meter?
Inspect your wiring for shorts to ground, broken wires,etc.
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Old 07-10-2018, 04:43 PM
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Originally Posted by RAD4Runner View Post
14.5 is not overcharging (search "how charging system works")
Got multi-meter?
Inspect your wiring for shorts to ground, broken wires,etc.
it might not be overcharging in theory but typical v for this gauge and vehicle is 13.0-14.0v. I havent seen it go that high also as soon as it did the tach went out of control and soon after that car lost power so it cant be right. Cant find a short at a glance, might have to remove the harness and alternator for a proper inspection.
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Old 07-10-2018, 08:17 PM
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13.5 to 15.1V depending on temperature.
Yes, gotta dig into the harness, especially the think "B" Cable.
What's EM2? Care to share schematic so we can better help?

Then the truck died no battery power to vehicle..
But you said your new battery has 12V on gage. How did you you know no battery power to vehicle?
Connections have bare, shiny metal tightly contacting bare, shiny metal?

Repeat: Got multi-meter?

Last edited by RAD4Runner; 07-10-2018 at 08:19 PM.
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Old 07-11-2018, 12:44 AM
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Red face

Then it might be as simple as a poor ground connection

Second guess .

Shorted Diode in the rectifier ?? most likely would open the main circuit protection

I think OP might have meant the 30 amp AM2 Fuse or fusible link depending what that has
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Old 07-11-2018, 03:41 AM
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Originally Posted by RAD4Runner View Post
13.5 to 15.1V depending on temperature.
Yes, gotta dig into the harness, especially the think "B" Cable.
What's EM2? Care to share schematic so we can better help?


But you said your new battery has 12V on gage. How did you you know no battery power to vehicle?
Connections have bare, shiny metal tightly contacting bare, shiny metal?

Repeat: Got multi-meter?
em2 is one of the fusible links in the main fuse box. Found the problem it was the wiring going from the battery to the fuse box. Replaced and all is back to normal. Iím not sure how the odd symptoms are connected.
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Old 07-11-2018, 06:01 AM
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Originally Posted by the171 View Post
... it was the wiring going from the battery to the fuse box. Replaced and all is back to normal. ...
The "wiring" from the battery to the fuse box includes the fusible link (the failure of which could explain most of your symptoms). https://parts.lakelandtoyota.com/sho...String=fusible

Did you replace it WITH a fusible link? If you just put a chunk of wire in there, you're bypassing what kept your truck from catching on fire a few days ago.
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Old 07-11-2018, 05:43 PM
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I appreciate your help but That part is not applicable here. This is a 93 pu with 22re engine. The wiring goes from the battery directly to the 80 amp fuse aka fusible link. There are also 30a and 40a fusible links. I have replaced the battery, fuse box supply wiring, and all 3 large fuses. Everything is working very well again, charging to a max 14.0v 😉

tried including a photo but itís not working off the phone anyway you get the idea case closed all good.
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Old 07-11-2018, 06:01 PM
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Originally Posted by wyoming9 View Post
Then it might be as simple as a poor ground connection

Second guess .

Shorted Diode in the rectifier ?? most likely would open the main circuit protection

I think OP might have meant the 30 amp AM2 Fuse or fusible link depending what that has
This is a good guess I have had this happen before, blowing the battery fuse. I considered a shorted alternator but it appears not so. And yes I was referring to the 30a em2 fuse. I am still unsure why this one blew but as of now things seem ok.
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Old 07-11-2018, 08:47 PM
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Originally Posted by the171 View Post
... That part is not applicable here. This is a 93 pu with 22re engine. ...case closed ...
Case closed? Not applicable? Just which part do YOU think is supposed to go where the fusible link was before?



It's your truck (and your life); you can bypass all the fuses too if you want.

i wish you the best of luck.
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Old 07-12-2018, 07:48 AM
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Like scope says ^^^
Originally Posted by the171 View Post
tried including a photo but itís not working off the phone anyway you get the idea case closed all good.
A picture paints a thousand words.
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