20 Most Recent 1990 Toyota Pickup - Page 4 Questions & Answers

17v on is bad. its too high. are you using a good voltmeter. a DMM, ? or relic analog meter.? you put a new alternator in the car? not from autozoned i hope. the wiring to the Alternator must be all good, them includes the case ground and battery cables, end to end, good and tight and not corroded. the regulator is inside your ALT> the ALT has 5 connections 1 is ground. any bad, reg can go nuts. newer cars , go less nuts. they detect more errors and shut down your is overcharging and will burn a battery up in no time.(heat) wire: Grounds good. idiot lamp ,must be there, an working or alt may start up dead. the lamp creates excitation currents, to boot up ALT. wire B, goes to battery via fuse link, if this big wire fails. all bets off. wire IG goes to 7.5A gage fuse, it must not be blown. wire S, (sense) is 5amp ALT-s fuse, this senses battery voltage if this wire drops in voltage the ALT will go to max. (or shut down) toss coin there, lots of regs sub'd out in so many years, and rebuilts. the regulator is not working right. that means 3 things. 1: reg is bad. 2: reg is being lied to. (bad wires) even bad battery.

add one. sold everwhere , us a correct fuse in line. or buy a power pod upgrade, and wire that in, it like 2 or 3 cig sockets

state the problem. dead, makes noise, bounces,, is off accuracy, or what. ???????????????

funnel with a reduced long neck on it..pour slowly..check after each qt with engine running..use the stick tube..

Check for vacuum hose leak like a hose that became disconnected, hose that is split, burnt a hole in, etc (or PCV valve failure). Indications are, will not run at idle, runs rough, the slower you go, the worse it runs. best of luck resolving this problem.

If you look at the relay it has a wiring diagram on the side of it, showing the power wires (recall 87 being one of them) and the control wires. Can't tell you color, perhaps a Toyota tech could but in my experience they vary.

Take it to a transmission mechanic.

Try the fuel pump relay. Next try a fuel pump. ( might be getting hott and shutting off.) Finally try a computer, ( i had that same problem and the car was shutting down on the highway ) I put a computer in it and it fixed it for good.

It should be mounted on top the trans. near the shifter look for 1 or 2 wires running to the top of the tranny.

over heats

altenator

The Feol pump/circuit opening relay is located inside the cab on a relay block either behind the glove bosx or the right kick panel, I'll see if I can locate a location diagram and post it in a follow up. In the meantime locate the diagnostic check connector under the hood,it's located near the right fender on a fuse block, open the cover and put a jumper wire between the terminals FP and B+, turn the key on and let me know if this makes the fuel pump run.

check all bulbs,inspect sockets for corrosion,rust ,or sighns of overload.follow wires and check connectors if all good ,replace the flasher ,,if that doesnt fix it ,the blinker switch in the steering coulmn would be next

You don't have a Manuel it's in there.

check battery positive cables for overheating or shorting out massive power drain in a short time has to heat a cable somewhere