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2 Electrical questions

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andyborris Posted a lot Freedom is just another word for nothing left to lose. Posts: 2,218	2 Electrical questions andyborris @andyborris
	Jun 23, 2013 15:37:44 GMT Select Post Deselect Post Link to Post Back to Top
	The first, tank sender has 12V to it, but fuel gauge is dead. However, the gauge works if 12V is sent to it directly and not through the sender. Senders dead? The 2nd, installing a battery master switch. Battery is in the boot and the earth lead goes to the chassis, when I introduce the master switch into the circuit, I get the same symptoms as a loose battery lead, remove the master switch and it's fine. 2 switches have been tried and both are the same, I've been bolting the lead to one of the terminals and using the other terminal to bolt to the chassis directly at the same point as used by the earth lead. Any suggestions? Getting fed up with unbolting the earth lead every time I park the car, which isn't used every day. thanks


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1980escort Posted a lot Posts: 1,047	2 Electrical questions 1980escort @1980escort
	Jun 23, 2013 16:26:07 GMT Select Post Deselect Post Link to Post Back to Top
	Have you fitted the White resistor to the master switch?


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bortaf Posted a lot Posts: 4,549	2 Electrical questions bortaf @bortaf
	Jun 23, 2013 18:04:16 GMT Select Post Deselect Post Link to Post Back to Top
	Usually a fuel sender doesn't have a live to it, the gauge has the pos 12V and it's earthed through the variable resistor that is the sender but not knowing what car we are on about I cant be sure ? the sender is usually sealed buy a rubber seal so it will usually have another wire on it going to earth as the seal prevents it earthing through the tank (metal tank). curse word cheap cut off switches off ebay for under a fiver ? if so try a decent make, I've had problems with the cheap ones before.
	Last Edit: Jun 23, 2013 18:15:21 GMT by bortaf R.I.P photobucket

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Dorset_Clive Part of things Posts: 695	2 Electrical questions Dorset_Clive @cochapman
	Jun 25, 2013 12:58:51 GMT Select Post Deselect Post Link to Post Back to Top
	A way to check if the cutoff switch is at fault is to put a volt meter across the switch. When open (i.e. switched 'off) it should read 12V, and when closed 0v. If you get a reading above a few mV then you've got some unnecessary resistance within the switch.


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andyborris Posted a lot Freedom is just another word for nothing left to lose. Posts: 2,218	2 Electrical questions andyborris @andyborris
	Jun 25, 2013 18:37:32 GMT Select Post Deselect Post Link to Post Back to Top
	The fuel gauge sender is on a Triumph, it's got an earth lead, 12V feed and a lead to the gauge. Putting 12V through the lead to the gauge gets a reading. Nothing on the gauge when 12V is applied via the sender! Not a cheap switch, (neither was the first switch!) the Ebay vendor is going to replace it. Just wondering if the fact that I bolted one terminal directly to the car chassis, rather then through a battery lead, could cause a problem. It isolates perfectly, what it won't do is supply enough power to operate the starter. It's exactly like a loose battery terminal, lights etc. work fine, but as soon as you use the starter, click and nothing!


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