autometer electric guage wiring - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

 
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post #1 of 13 (permalink) Old Feb 4th, 03, 11:11 PM Thread Starter
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ive an electric oil press, water temp, and volt gauge from autometer. my question is can get away wiring the 12v power in series or do i have to rig up a way to run it in parallel? same question for the little light bulbs in there. im guessing if i wired it in series that the voltmeter would come first so it would get the full reading correct?

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post #2 of 13 (permalink) Old Feb 4th, 03, 11:53 PM
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Sure you can wire them in series like that. That;s the way I'd do it.

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post #3 of 13 (permalink) Old Feb 5th, 03, 8:17 AM
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I'm not sure whether the "voltmeter" and an
ammeter are the same thing but an ammeter will need to be wired in series and I believe not between the altenator and battery.
I personally would not wire the light bulbs in series for a couple of reasons.
One the more you have the dimmer they will become. Also If one bulb goes out you will break the connection. If this is not good information I'm sure John will chime in on this.

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post #4 of 13 (permalink) Old Feb 5th, 03, 9:48 AM
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THIS is how I would wire the gauges.

[This message has been edited by Elree Colby (edited 02-05-2003).]
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post #5 of 13 (permalink) Old Feb 5th, 03, 9:12 PM
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By series do you mean run the wire to one guage and then jump to the next and then to the next? That isn't really series but parallel.

The other option is to run a wire from the ignition switch to each guage individually but that isn't at all necessary for the low current draw the guages would put on the wire.

Follow what Elree shows.

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post #6 of 13 (permalink) Old Feb 6th, 03, 8:55 AM Thread Starter
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no i really meant series....12v to the voltmeter then the voltmeter ground to the water temp 12v, water temp ground to oil press 12v and the oil ground to an actual ground. is that ok?



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post #7 of 13 (permalink) Old Feb 6th, 03, 9:26 AM
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"12v to the voltmeter then the voltmeter ground to the water temp 12v, water temp ground to oil press 12v and the oil ground to an actual ground. is that ok?"

NO! Wire them parallel as shown. It would be impossible to wire the ground of the water temp sender to the 12v of the oil pressure gauge. The senders, oil press and water temp, ground to the engine block when installed. If you could wire them in series and did. You would end up with inaccurate gauges.
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post #8 of 13 (permalink) Old Feb 6th, 03, 6:37 PM Thread Starter
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alright cool, thanks..thats what i wanted to know. ill do it like in the diagram

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post #9 of 13 (permalink) Old Feb 6th, 03, 11:10 PM
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Also, each guage is made to operate with a a full 12V applied to it. If you wire them in series then each gauge only has a portion of 12V applied and not the full voltage.

I could go into a the full ohms law explaination but a simpler explaination is that if each guage requires exactly the same current then with 3 in series each would only get 1/3 of the voltage (4V) and none of them would work.

The same applies for the bulbs. Put then in series and they'll either not light or be very dull.

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post #10 of 13 (permalink) Old Jul 6th, 03, 10:50 PM
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hey el whats the lps in ur diagram

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post #11 of 13 (permalink) Old Jul 25th, 03, 10:23 AM
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Thanks for the diagram Elree.

I am attempting to wire my oil pressure and H2O temp gauge also, and it doesn't help that I'm electricity ignorant. Should the wiring for the gauge lights be wired the same as the ignition wiring, running to one gauge, and then from that gauge to the next, and so on? Any insight would be appreciated...

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post #12 of 13 (permalink) Old Jul 25th, 03, 1:18 PM
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Yes, wire the bulbs in parallel.


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post #13 of 13 (permalink) Old Jul 25th, 03, 3:31 PM
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Thanks for the reply '71, I am hoping to get the gauges wired and 454 alive for the first time this weekend.

I can't wait...

Justin
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