Alfa Romeo/Alfa Romeo Digest Archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Fw: [alfa] MarelliPlex & multimeters



----- Original Message ----- From: "Bill LeClair" <billleclair@domain.elided>
To: "alfacybersite" <acs@domain.elided>
Sent: Sunday, October 03, 2004 5:41 PM
Subject: Re: [alfa] MarelliPlex & multimeters



On an analog ohm meter you need to zero the meter when you switch scales, to do this select the scale you need, then touch the red and the black probe together, and then rotate the zero knob/dial until the meter points to the zero. You should then be good to go. You will need to re-zero the meter when you switch scales.

Do this every time you need to use the ohm portion of the meter.

Bill LeClair


----- Original Message ----- From: "alfacybersite" <acs@domain.elided>
To: "AD" <alfa-digest@domain.elided>
Sent: Sunday, October 03, 2004 3:26 PM
Subject: [alfa] MarelliPlex & multimeters



Frank Smith was kind enough to forward me Centerline's test procedure for the control module. Essentially the test is to eliminate any of the other items in the "system" leaving only the control module as the guilty party if all tests out. Or if you prefer - process of elimination.

Everything has tested out except...the resistance between the + and - on the coil which is supposed to be .69 to .75 ohms. I get a wee bit over 2 ohms on both my Alfetta and "other" MarelliPlex coil. I'm concerned the error might well be in my ancient Radio Shack analog multitester. It only goes to 0 which is logically at the end of the ohm dial. Had it gone past 0 I would have surmised all was okay. However, when testing the ohms between the coil's center "socket' and either the + or the - it should read between 7100 and 8700 ohms. Testing with the dial set on RX1k, I get 6200 ohms on both coils. However, after retesting with it set on RX100 (and with needle close to the center) I now get 8200 ohms on both.

I'm thinking it is time to invest / go modern with an electronic multimeter for more accuracy. About 99% of the times I use my multitester is to see if a bulb is burned out or it isn't getting electricity (volts of course), or if one end of a wire belongs to another end (ohms).

I've always heard that coils virtually last forever unless something major causes them to fail. It occurs to me that both coils "could" have degraded the same over the years, but rather doubt the coincidence.

What nice, bulletproof, accurate, multimeter do youse guys recommend? I have a catalog from the ToolWarehouse.net which lists several from $439.75 (automotive specific Ferret) to $36.50 (ES). I prefer the latter price, but am realistic.

I rather liked the specs of the ES Deluxe Auto-ranging Digital Multimeter with RPM & Temperature @ $79.25.

Biba
Irwindale, CA USA --
to be removed from alfa, see /bin/digest-subs.cgi
or email "unsubscribe alfa" to majordomo@domain.elided
--
to be removed from alfa, see /bin/digest-subs.cgi
or email "unsubscribe alfa" to majordomo@domain.elided


Home | Archive | Main Index | Thread Index