guages going crazy

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pitbulll

Cadet
Joined
Apr 20, 2009
Messages
25
ok if i go pass 4000 rpm my rpm and temp guage start going crazy going up and down really fast mind you my temp guage dont even work i cant get it to tell me temp of engine.if i lower the speed down to 4000 rpm then guage goes back to normal.any idea what i can do
 
hoeser

hoeser

Petty Officer 1st Class
Joined
Jun 18, 2006
Messages
253
Re: guages going crazy

We need more information, engine year, model, etc...

That being said...I have seen this before on engines with a bad charging circuit related to a bad rectifier/regulator.
 
T

timalabim

Seaman
Joined
Aug 1, 2007
Messages
71
Re: guages going crazy

Not sure about the temp gauge, but I had the same tach symptom before I figured out my rectifier was bad and I wasn't charging.
 
hoeser

hoeser

Petty Officer 1st Class
Joined
Jun 18, 2006
Messages
253
Re: guages going crazy

Check your charging voltage... throw a multimeter on the battery with the engine off, start the engine, the voltage should increase substantially, at a high idle you should see close to 14V. If the voltage is unchanged from not running to running, you have a bad regulator/rectifier.
 
P

pitbulll

Cadet
Joined
Apr 20, 2009
Messages
25
Re: guages going crazy

hoeser said:
Check your charging voltage... throw a multimeter on the battery with the engine off, start the engine, the voltage should increase substantially, at a high idle you should see close to 14V. If the voltage is unchanged from not running to running, you have a bad regulator/rectifier.
Click to expand...

ok i will try this and up date thanks
 
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