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MG MGB Technical - overdrive-careful with test light

Special thanks to Chris and Rick. I have my car on stands now, but all indications are that my overdrive is now engaging. Learned a lot from these threads, so wanted to share my trials, to save some other people time, although feeling pretty stupid now. Was using a test light in series with power line to O/D solenoid to troubeshoot if solenoid was getting power. I finally figured out that the light was lighting as I powered the circuit, indicating continuity, BUT, the solenoid would not engage. With the light out of the circuit the solenoid would engage. So my advise is that the light is good for testing continuity , but it may rob enough voltage to prevent solenoid from engaging. I'm really psyched and can't wait to test on the road. Again thanks for all the help received.
r schwartz

That's great to hear, Bob. Be sure to post again letting us know about your successful road test. (Might as well be optimistic!) I bet we've all felt stupid at one point or another and I'm sure I'm destined to feel that way again....I just don't know when or where.
Good luck and congratulations.
Rick
Rick Jaskowiak

The solenoid draws around 3.5 amps so a test bulb in series will restrict the current available to the solenoid!

The same applies to testing using a battery charger - solenoids ( and fuel pumps) will not work properly with small battery chargers - you need a heavy duty one or to hook up a car battery.

To test properly you need an ammeter in series and a voltmeter in parallel - or buy a very expensive wattmeter!
Chris Betson

This thread was discussed on 01/03/2002

MG MGB Technical index

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