Aftermarket gauses - reading off with current draw
13-02-2009, 03:19 AM
#1
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Aftermarket gauses - reading off with current draw
I ordered some gauges online. They sell millions of these.
http://cgi.ebay.co.uk/SMOKED-GAUGE-OIL-PRESSURE-TEMP-BOOST-WATER-VOLTAGE_W0QQitemZ180327892530QQcmdZViewItemQQptZUK _CarsParts_Vehicles_CarParts_SM?hash=item180327892 530&_trksid=p32 86.c0.m14&_trkparms=66%3A4|65%3A16|39%3A1|240%3A13 18
Apart from me not actually liking them... when I fire up the engine the oil pressure reads 2 bar after 5 minutes. 3 bar initially. Fine. Then it warms up and goes to 1.5 bar. If I turn on the lights or turn on the blower motor they dip down and read nothing.
I triple checked the installation. My charging system is fully functional. Installed as their wiring diagram says. Triple checked....
What causes a resistance circuit to be affected by current draw? Do Sierras work better with mechanical gauges? something weird in the dash wiring?
http://cgi.ebay.co.uk/SMOKED-GAUGE-OIL-PRESSURE-TEMP-BOOST-WATER-VOLTAGE_W0QQitemZ180327892530QQcmdZViewItemQQptZUK _CarsParts_Vehicles_CarParts_SM?hash=item180327892 530&_trksid=p32 86.c0.m14&_trkparms=66%3A4|65%3A16|39%3A1|240%3A13 18
Apart from me not actually liking them... when I fire up the engine the oil pressure reads 2 bar after 5 minutes. 3 bar initially. Fine. Then it warms up and goes to 1.5 bar. If I turn on the lights or turn on the blower motor they dip down and read nothing.
I triple checked the installation. My charging system is fully functional. Installed as their wiring diagram says. Triple checked....
What causes a resistance circuit to be affected by current draw? Do Sierras work better with mechanical gauges? something weird in the dash wiring?
13-02-2009, 03:27 AM
#2
Definitely sounds like a wiring problem from your description... I had an air fuel gauge fitted to an old car and when the blowers were on 1, 2 or 3 the gauge worked perfectly but when I switched to top setting 4 the gauge cut out. I assumed that I'd wired it to the temperature control as setting 4 was the windscreen one and it automatically went to high heat when that was activated.
Offtopic a wee bit, but thats pretty low oil pressure... do Cossies run that level normally?? My Scoob will see 7bar+ from a cold start, levelling out to about 6bar when driving up to temperature and warm idle will sit around 2bar.
Cheers,
Grant
Offtopic a wee bit, but thats pretty low oil pressure... do Cossies run that level normally?? My Scoob will see 7bar+ from a cold start, levelling out to about 6bar when driving up to temperature and warm idle will sit around 2bar.
Cheers,
Grant
13-02-2009, 03:58 AM
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This is on my 2.3 Lima powered Merkur XR4Ti. Normal oil pressure is 2.7 bar to 4 psi at 2000 rpm warm. I'm just idling it.
What did you do to solve the high heat problem?
What did you do to solve the high heat problem?
13-02-2009, 07:45 AM
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Yeah, I'm full of typos tonight. My laptop is in a weird spot this evening. Too much stuff on my desk. so I'm typing from a weird and angle and not paying attention.
4 BAR I meant...
Relay is internal. I tried running them off separate relay right from the battery. No luck. They still have the drop to zero when the fan or lights come on.
4 BAR I meant...
Relay is internal. I tried running them off separate relay right from the battery. No luck. They still have the drop to zero when the fan or lights come on.
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