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Old 09-07-2010, 02:11 PM   #1
gszakal
Scooby Newbie
 
Member#: 73956
Join Date: Nov 2004
Default ABS and Charging Problem may be related

Hello All

I have an interesting electrical problem that I have been chasing. It took me a while to resolve the problem down to where I have it including replacing the Alternator, replacing the ABS Pump, and then just getting lucky (sort of) so here is the problem.

My ABS and Cruise control work if I don't have running lights or headlights on. If I turn on lights the ABS light goes on and I lose ABS and Cruise control. Turning off the lights wont get it going again, I have to turn the ignition off and back on, then they work again for as long as the lights are off.

My charging system doesn't work as long as the handbrake is engaged. The charging system does work if I have the brakelights and/or headlights on. The voltage can be seen to be 14.x with handbrake off, Battery voltage with handbrake on.

These tests when I finally figured it out this far are completely repeatable.

I do have some Electrical modifications but none of them are even close to recent, they are.

LED Brakelights, Rear Running Lights, and Signal Lights from superbrightleds.com
HID Headlights with Lightwerkz relay harness (no Leveling harness) vampire connection to left headlight
LED Signal lights in the Gauge Cluster
LED Blinker Unit from superbrightleds.com
DRL disabled by removing DRL Relay and resister from engine compartment.

I have had a couple problems with my gauge cluster that required bridging and repair of blown traces but when I examine it carefully I find no more blown traces. these all happened after installing LED lights and were repaired and functional long ago.

I am thinking that the common denominator is the gauge cluster and am trying to source a KPH cluster for testing without buying a new one.

I have also tried driving without the gauge cluster connected at all.
Car will start, run, and I can drive however

Antilock doesn't work.
Charging system will not work.
ABS will not work.

Thanks in advance for any help.
Jerry
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Old 09-07-2010, 06:10 PM   #2
Cougar4
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Member#: 53443
Join Date: Jan 2004
Location: Anchorage, AK
Vehicle:
2001 LL Bean Outback
Winestone

Default

Try running a temporary 12 gauge wire jumper wire between the negative battery post and a good clean connection to chassis ground. If that clears up the brake problem then you have a bad chassis ground to the battery. The handbrake trouble may be due to a bad isolating diode in the cluster.
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Old 09-22-2010, 11:50 PM   #3
gszakal
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Member#: 73956
Join Date: Nov 2004
Default

The ABS and Charging System are not related.

I decided to remove the LED taillights to see if there was a connection between the two circuits as can happen with a standard bulb if one of the filaments breaks and falls across the other to connect the two circuits.

The ABS problem is solved by removing one of the LED Taillights.

Charging System still stops when the handbreak is applied. I will be chasing through the wiring diagrams.
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Old 09-23-2010, 02:21 AM   #4
Cougar4
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Member#: 53443
Join Date: Jan 2004
Location: Anchorage, AK
Vehicle:
2001 LL Bean Outback
Winestone

Default

I think there may be a bad isolating diode in the cluster that is causing the charging problem. Some other folks have had this problem.
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