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24V Lightweight starting/electrical problem ... help needed pleeease

Hi, I have '74 Series3 24v lightweight FFR It is causing me a major headache at the moment, there is 24v at the ignitiion switch in the off position, but when you turn the key to position 1 or start it changes to 0 v. No dash lights illuminate and the thing is dead. BUT put a wire directly from the battery to terminal 1 on the ignition switch and it works as normal. It is a new ignition switch but it definately works. Once the engine starts it runs fine even if you remove the temp wire from the battery, I guess it gets its power from the alternator.

Any suggestions? apart from use a temp wire which I've already contemplated

thanks richard confused

Reply to
Richard Adcock
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On or around Sun, 09 May 2004 22:34:09 +0100, Richard Adcock enlightened us thusly:

crappy connection somewhere between the battery and the ignition switch. Or a hidden break in the wire. Work out where the wire goes, disconnect from power and test with a resistance meter.

Reply to
Austin Shackles

If you don't have that reprint of the Military manual, get it. It has the circuit diagrams, and the 24v alternator system isn't arranged like any civvy rig I know of.

This does seem obvious enough. Switched off, no current is flowing, except for a very tiny amount through the meter. So the bad connection can be a pretty high resistance without the voltage dropping enough to notice. But, switched on, the rest of the system has a relatively low resistance, reversing the balance, and most of the volts are across that bad connection.

If your meter is like my cheap digital meter, you'll be measuring on a

200-volt range, which means a meter resistance of several million ohms.

But check your battery-chassis connection is good. If the bad connection is there, and your meter was measuring voltage relative to the chassis, you can get similar results.

Reply to
David G. Bell

On Mon, 10 May 2004 08:09:36 +0100 (BST), snipped-for-privacy@zhochaka.demon.co.uk (

I have one

You can say that again, it goes all over the place

I will do that, but temp I bridged he live across to the starter solernoid and it all works even the charging circuit. I will find the proper reason (break/duff connection) and fix it properly in the next couple of years :) in the meantime it works :)

richard

Reply to
Richard Adcock

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