Question about 1993 Toyota Pickup

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On my 1993 toyota pickup alternator, there is continuity at the red wire on the plug but no voltage. what is this wires purpose? my battery light is on in the dash and staying on. battery is steady at 12 volts. the alternator is new and the battery has tested good.

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  • 273 Answers

Have you checked your belt for looseness?

Posted on May 20, 2011

  • mike_drennon May 22, 2011

    belt is tight. bought a book so maybe it can help shed some light on it

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3 Answers

Replaced alternator but battery light stays on the dash


This light on dash is telling you, alternator is not charging or current is not reaching battery. With a voltmeter check your alternator output at battery. It should be at least 13.5 volts. If less than that check output at back of alternator, big red wire bolted to alternator. If voltage is within specs. then you may either have a blown fuse, open(broken) big red wire from alternator to baterry. Check big red wire circuit integrity by proving back of alternator where wire bolts to alternator. With the engine not running, there should be battery voltage at that bolt/wire. If no voltage repair open in circuit, either a fuse or broken wire( usually). If still no output(13.5 volts) or more, check power ground to alternator plug. If these power ground check out ok, then you more than likely have a defective alternator.

Feb 07, 2016 | Cars & Trucks

1 Answer

Yellow wire at alternator whats its power sorce 88 toyota pickup


well with the vehicles running while you're getting this voltage reading then it very well could be coming from the alternator

Apr 29, 2014 | 1988 Toyota Pickup

1 Answer

I have a draw on the battery on my 85 Toyota pickup it kills a fully charged battery in about 2 hours... Ive put a volt tester between the disconnected positive battery cable and the positive battery post...


Go to You Tube Video & see how to do a parasitic CURRENT
drain test

What you have done so far with a test light & volt meter is basically
doing nothing

You need an amp meter & a wiring diagram,then pull fuses one
at a time, to get to the circuit that causes the drain,then use the
prints to test that circuit for voltage drops

Mar 15, 2014 | 1985 Toyota Pickup

1 Answer

I have a 93 toyota pickup . alternator wiring ??


the thicker red wire connects to the (BAT) and the other is the ground

Mar 13, 2010 | 1993 Toyota Pickup

2 Answers

84 toyota. altenator not charging


The diagram shows a capacitor between the regulator red wire and ground on some models. If your truck has that cap, you may want to check it or replace it. I don't see anything else on the diagram that could cause this behavior, unless there is a bad connection somewhere. If that red wire powers the field winding, a bad cap could be pulling down the voltage.

Jun 18, 2017 | 1989 Toyota Pickup SR5

2 Answers

1993 Toyota Paseo won't keep charge.


the thiree wires usually are, one large heavy dity main wire that takes the charge current, one charge indicator wire and an exiter wire, when a car starts discharging it is usually one of the diodes in the alternator failed, there are usually 6 of these(at least) andthey should be dead short one way and open the other way when they fail they can be lowish resistance both ways and this discharges the battery, it will still show about 14 volts and give out 5/6ths of its rated amps but will drain, the ignition light(or charge light) is just a bulb from live to one diode and unless it is that diode that failed the lamp will work fine.The way to check is to measure the current through the alternator when the car is switched off, it should be very nearly zero

Sep 12, 2009 | 1993 Toyota Paseo

1 Answer

94 toyota pickup 80 amp fuse blown-truck will not crank. I have no wiring diagram, or even an owners manual. Belongs to a friend, he just shut it off at work, came out to go home, no crank. This is a large...


have him check the wiring to the alternator and the alternator itself. the big boy that blew is for the alternator on the small pickups. also check the line going from the underhood fusebox to the positive battery terminal, they tend to break off.

Jun 12, 2009 | 1993 Toyota Camry V6

2 Answers

Charging Problem 1993 toyota pickup


Hello! I too am PA St Insp Mechanic.

Here are some suggestions:

Note that the Fuel injection computer starts to cease to work properly at 10.5 VDC. This leads me to a voltage issue. You mentioning that the veh has bright headlamps may be consuming more power than the alt can deliver, with the heater, the lights and the other "normal" draws.

Test the alt output with a voltmeter, plus to plus, minus to minus, at the battery. You should read 14 + volts with all of the above mentioned accessories on, at idle. 11-12 volts = bad alternator, unless the belt is real slipping bad. 14.4 is the spec.

Also, the Voltage Regulator in inside the alternator.

Glad to provide assistance to you; please rate my help with a FixYa, I would be very grateful.

Jan 22, 2009 | 1993 Toyota Pickup

1 Answer

Battery light comes on when I give it the gas and the voltage goes up. Battery and alternator have both been replaced. What could be the problem? It is in a 1989 Toyota Pickup. V6 3.0


Make sure the wires are tight on the back of the alternator and the belt is tight. If they are, the alternator has a bad diode in it.

Nov 24, 2008 | 1989 Toyota Pickup SR5

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