1995 Isuzu Trooper A/C drawing down voltage

Tiny
JB3613JB60
  • MEMBER
  • 1995 ISUZU TROOPER
  • 118,000 MILES
A/c magnetic clutch was engaging/disengaging every second. I turned off a/c and wiggled the wiring to magnetic clutch. That problem stopped, but now when a/c is turned on it drops the voltage to 10 volts which will not maintain battery charge. I turned on wipers, lights and heater with no voltage drop. Shtopped
Monday, August 5th, 2013 AT 3:42 PM

8 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Where are you reading that voltage?

Is the engine running?
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Monday, August 5th, 2013 AT 4:13 PM
Tiny
JB3613JB60
  • MEMBER
  • 5 POSTS
Engine is running. Read on volt meter in dash
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Monday, August 5th, 2013 AT 5:47 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You can't believe that. You need to read it with a digital voltmeter at the battery.
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Monday, August 5th, 2013 AT 5:50 PM
Tiny
JB3613JB60
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  • 5 POSTS
Ok. Iwill check tomorrow. And it readsthe same I will get back to you. Thanks"
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Monday, August 5th, 2013 AT 6:22 PM
Tiny
JB3613JB60
  • MEMBER
  • 5 POSTS
Checked with volt meter at battery with engine running and when a/c is engaged voltage is dropping from 14 to 11 volts. Turn a/c off and it is back to 14 volts. Turn lights, wiper, and heater on at same time and no voltage drop. Only when a/c is turned on. When this problem first started the magnetic a/c clutch was engaging and disengaging in rapid succesion. I wiggled the wiring to the magnetic clutch and it stopped disengaging and stayed engaged but the voltage drop problem appeared. A/C still gets cold even with voltage drop but I am afraid to use a/c for fear of draining my battery. Please advise. Thanks!
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Tuesday, August 6th, 2013 AT 7:54 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You are just consuming more current than the alternator can keep up with at that RPM. I you raise the RPMs even slightly, the problem should disappear.
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Tuesday, August 6th, 2013 AT 9:06 AM
Tiny
JB3613JB60
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  • 5 POSTS
Not the case. I drove trooper at 65 MPH. Turned AC on and still had same volt drop. Could compresser be going bad?
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Tuesday, August 6th, 2013 AT 10:51 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Then you have something wrong with the charging system.
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Tuesday, August 6th, 2013 AT 11:14 AM

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