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No power at all ... need help diagnosing

TMG

Well-known member
Joined
Oct 1, 2007
Messages
133
Location
NJ
Drove the car today after a month and filled up with gas. Car was running great until I got home. While parking the car, it suddenly died. No power at all. I thought it was the battery so I charged it (it wasnt dead but did need a little charge)and tried again with no luck. I checked all the fuse in the engine bay and inside the cabin but all seem good. The ECU was already capped but I did not look today to see if there is anything obvious.

There is just no electricity coming in so cannot turn the engine over, everyhting is just dead. Any suggestion on what I should look at next? Alternator?

TIA for your input. Jojo
 

Terry Posten

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Joined
Dec 16, 2003
Messages
9,009
Location
Davenport, Iowa USA
Do you have ANY power in the cabin? Like door lights, radio, clock, etc...

When you turn the key, any dash lights, hear a click when turning the key?

If no power at all, anywhere: check the large, bolt-in master fuses at the battery. There are 3.

If you have power in cabin, check your clutch kill switch, check the large harness plug in the engine bay directly under where the stock MAS sits. It is on the frame rail and if loose, can cause no crank and no run. Because it feeds the MAS wiring, starter key switch trigger wire, and more.
 
Last edited:

TMG

Well-known member
Joined
Oct 1, 2007
Messages
133
Location
NJ
No power inside that cabin at all (no radio, light, seatbelt) so cannot even crank the motor.

I checked the fuse that is attached to the + terminal (specially the 100 AMP) and it is good.
 

Terry Posten

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Joined
Dec 16, 2003
Messages
9,009
Location
Davenport, Iowa USA
Do you own a multimeter?

What is the voltage at the battery without any wires attached?

What s the voltage at the battery with wires attached?

If you have 12.5ish volts with both tests above, have someone turn your key to the start position while checking voltage at battery. What happens?
 

acidrumz

Well-known member
Joined
Sep 13, 2004
Messages
117
Location
Stp, Mn
Check the wiring and connectors going to the key ignition/steering column.
For some odd reason my TT adapter to the connectors was burnt/melted.
Had symptoms like yours.

GL.
 

dammitjim

Well-known member
Joined
Oct 11, 2011
Messages
312
Location
WI
Quoting TMG:
No power inside that cabin at all (no radio, light, seatbelt) so cannot even crank the motor.



Sounds like a loose/dirty battery terminal or a bad battery cable.
 

TMG

Well-known member
Joined
Oct 1, 2007
Messages
133
Location
NJ
Thanks for the replies. I will check again and see what I find.
 

TMG

Well-known member
Joined
Oct 1, 2007
Messages
133
Location
NJ
Finally got the car running. The power loss was due to a totally dead battery so I hooked up another battery and the car started immediately but but when I stepped on the gas it started cutting off and there is a spark under the dash right by the ECU. There are no sparks at idle and the idle is steady.

Has anybody experienced this before? I have not pulled the ECU yet (fyi it was capped before) to see whats going on with it. I dont know if this new issue is due to losing the power and now there is a short somewhere and the ECU is getting fried.
 

mikus

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Joined
Jan 11, 2007
Messages
2,763
Location
Aurora IL
Focus on that spark issue first. Down in that corner you have MPI & ECU, MPI is under the right side of glovebox. take both down, disconnect and inspect thoroughly for burnt/melted/loose wires, look closely at MPI for melt damage, look for "aftermarket" loose wires. May want to bench test your MPI while it's off, not hard to do.

What aftermarket stuff is wired onto your car and how, specifically, is your fuel pump rewired (location, source & gauge of wire)
 

TMG

Well-known member
Joined
Oct 1, 2007
Messages
133
Location
NJ
I'll check both, thanks. Currently, the only wiring that is aftermarket is for the alarm system. Fuel pump has not been rewired yet.
 
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