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 Post subject: glow plug current
PostPosted: Mon Sep 04, 2017 2:58 pm 
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Joined: Sat Apr 28, 2012 4:07 pm
Posts: 52
Location: brockville ont canada
Just rebuilt my 2nd motor runs great I have my own design intake heater using 3 bosh 12 volt glow plugs which is operated by timer
modual In order to monitor the performance I fitted 100 amp hall effect amp meter
I also fitted 5volt glow plugs and new modual in head
So puzzle this If the 5 volt plugs are to come on before engine starts why do I only get 9.7 amp draw with key in on position and
goes to 45 amp when first started slowly drops to 6 to 8 over the next 3 minutes or so :?:
My other diesels are preheat systems this seems to be post heat
regards tony


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 Post subject: Re: glow plug current
PostPosted: Mon Sep 04, 2017 3:23 pm 
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Joined: Fri Jun 22, 2007 11:43 am
Posts: 3793
Location: Green Cove Springs FL
Where is your amp meter connected?
Is it connected around one of the glow plug wires?

You said you have 5v plugs. Does your ECM have the 5v programming or 7v programming?
The glow plug relay has nothing to do with glow plug voltage.

The ECM determines how long to cycle the plugs by ambient temperature. If it's warm out they won't get as much current.

_________________
Bought my '05 CRD on June 2nd '07, used with 29,000 miles.
intake elbow and EGR delete. 7 volt Etecno glow plugs
Yeti stage 2 ECU tune. Straight pipe exhaust. DIY intercooler hoses
Provent and modified factory 180F thermostat
Replaced cylinder head (cracked) at 160,000 miles + ARP studs
Cheap 1 inch lift, 245-75R-16 tires.
Still love it.


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 Post subject: Re: glow plug current
PostPosted: Mon Sep 04, 2017 7:32 pm 
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Joined: Thu Oct 22, 2015 8:07 pm
Posts: 274
Location: Southeast Michigan
dh100m wrote:
If the 5 volt plugs are to come on before engine starts why do I only get 9.7 amp draw with key in on position and
goes to 45 amp when first started slowly drops to 6 to 8 over the next 3 minutes or so :?:
Does your amp meter tell you which direction the current is flowing? That 45 amps could be power going to the battery after you start the engine (alternator replacing the energy that was used to start the engine).


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 Post subject: Re: glow plug current
PostPosted: Tue Sep 05, 2017 9:02 am 
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Joined: Sat Apr 28, 2012 4:07 pm
Posts: 52
Location: brockville ont canada
The amp sensor is a Hall effect metering device which the smaller of the to + battery leads pass thru the donut sensor to by pass starter current the meter measures + and - direction Good point about direction tho will unplug glow plugs and see results

just plugged in glow plug relay and fitted glow plugs. No programming so maybe over voltaged a little will have to see
cheers


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