Quote:
Originally Posted by compress ignite
A weak Battery does require especial Charging.
1.Proper DISTILLED water fill of each cell.
2.Nice OVERNIGHT 1.5 to 2 Amp charge with a 3 step Charger.
(May be as long as 24-48 hrs.)
3.After Full Charge cycle turn on Headlights for a 10 second period to burn off
"Surface Charge". (Or wait 2 Hrs for Battery to equalize)
4.Measure resting battery BOTH with a DMM (for Voltage)and a Hydrometer
(For Specific Gravity).The Specific Gravity Measurement is the Ne Plus Ultra,
or True Determinant.
http://www.schumacherproducts.com/applications/?id=0007
Check ALL your grounds!(and connections "Clean,Shiny and Bright")
The Pre-Glow Relay has it's own ground to Chassis.
the Engine to Chassis strap Ground must also be good.
The fact that your GP relay is delivering 8 Volts tell you it's working.
"Somezing" is interfering with delivery of Full Voltage to the GP relay.
(Or delivery of Full Voltage from the GP relay to the Glow Plugs)
[AKA WIRING from GP relay to the Gps] |
Thanks for the tips, the battery is nearly new and delivering 12.9 to the relay with the ignition off.
At any rate, I've checked plug resistance, two GP's were replaced earlier this year, all plugs save for one are at about .5 ohm resistance. The other is at 18 ohm resistance but that's not bad enough to cause the system to fault completely. I'm almost certain that the relay has gone bad.
The clincher is that the relay is only allocating 8V to the gp harness connector at the relay...to every plug and hence I really think it's gone bad. That is unless there's another outside influence on the GP relay, like a temp sensor that is falsely telling the relay that glow is unnecessary.
Regards
Steve A