1993 Mazda Truck Won't start

THELOD

MEMBER
1993 MAZDA TRUCK

Electrical problem
1993 Mazda Truck 4 cyl Four Wheel Drive Manual

This problem JUST started. When I go to the truck - NO power - at all. Battery dead.

So I have tried another battery. Battery drains, with truck off. Drains to around 1.7 volts, drains within 5 minutes.

ALT is only about 2 months old.

Every works fine - ALT charges everything when running. Can have everything ON (i.E. Radio, lights, flasher and etc). And ALT and battery are good and everything does was it's suppose to do. Everything works correctly, i.E. Blinkers, flashers, headlights and etc. Dome lights are shut off, radio off. But it just drains.

So any ideas, what this "big" drain could be? What do I start looking?

Computer is about 3 or 4 years - I have NOT looked at that. No fuses are blowing. They all look good. Connections are all good. Looked under the truck all wiring looks good and not frayed, cut (but that maybe misleading).

It's 93 Madza B2600i

7 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Sounds like a short circuit somewhere in the electrical system-Do below to track it

Was this

answer

helpful?

Yes

Sunday, September 7th, 2008 AT 9:33 PM

THELOD

MEMBER
6 POSTS

Thanks for the information. However.

I can NOT read the whole thing you posted. I can not move the jpg, to read all of the text. How do I do that?

Where did you find that information?

SPONSORED LINKS

Was this

answer

helpful?

Yes

Monday, September 8th, 2008 AT 6:14 AM

RASMATAZ

MECHANIC
75,992 POSTS

I cannot buff it up-if I do you won't see it-sorry Okay just do this get a test light make sure all the lights are off glove/trunk etc. Then disconnect the negative battery cable attach the test light on the cable the pointed end to the battery negative terminal-is the light lit-if so start removing fuses one at a time the one that turns off the light is the trouble circuit.

Was this

answer

helpful?

Yes

Monday, September 8th, 2008 AT 12:28 PM

THELOD

MEMBER
6 POSTS

Thanks for the info/advice. So I tried the "light" thing. The light never went off. I pulled all the fuses under the dash and pulled the fuses under the hood (near the battery). And again, the light never went out. I did not pulled the 80 A fuse, under the hood, since that's a main - I assume, if I pulled that - then everything would just start working and the light would got out/off - but that would tell me nothing.

I also used a "Fluke meter" and and pulled all the fuses and measured - everything measured at 17.1 - went I pulled any of the fuses (again not the 80 Amp).

I do not have a "load tester', so hooking up the battery, would be worthless.

I tested the coil - that test fine (with fluke meter). I also tested the start, with NO load. But I left those readings in the truck.

I thought about unplugging the radio. But man, that thing is in there and hard to remove. I am thinking maybe that's were the short could be, even though when the fuse is removed, nothing changes and the fuse is NOT blowed. None of the fuses are blowed.

Anything else? Suggestions? Help me you are my only hope.

Was this

answer

helpful?

Yes

Wednesday, September 10th, 2008 AT 8:33 AM

RASMATAZ

MECHANIC
75,992 POSTS

What reading is this 17.1 is it voltage or milliamps Disconnect the alternator and see what hapens. If the light turns of the alternator has a shorted diodes.