No power when you turn the key, battery is charged

mt2man Posted a lot Posts: 1,364	No power when you turn the key, battery is charged mt2man @mt2man
	Jul 27, 2012 21:00:56 GMT Select Post Deselect Post Link to Post Back to Top
	Bassically as the title says! Its a 1987 diahatsu hijet, its a 1.0 efi, you turn the key and all you can hear is a relay clicking, nothing powers up or anything. No lights etc. Managed to find the clicking relay and its in a pair, am i right in thinking these relays power the fuel injection ecu and everything? I'm pretty sure its the relay (havent got any spare to swap over) but just wondered if its possibly something else causing the problem? The positive terminal was pretty naff and there is 2 smaller wires running to the battery too which had broken off, i have stripped these wires back and have connected them to a decent battery but still nothing. So pretty sure the problem isnt a uncharged battery as i tried 2 different batterys. Any ideas?


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ejenner Posted a lot Posts: 1,139	No power when you turn the key, battery is charged ejenner @ejenner
	Jul 28, 2012 7:29:15 GMT Select Post Deselect Post Link to Post Back to Top
	A relay is only an electronic switch so if you think it is faulty then try by-passing it by connecting the main power-in wire to the circuit it is supposed to be powering. Just use a piece of wire with two male spade terminals crimped onto either end. There are some 'timer' relays which have a bit of logic built into them and they are more complicated - the diagram on the side of the relay or labeling of the pins with a T would give you a clue as to whether or not you are looking at anything complex. For a basic relay you by-pass it by connecting the +30 to pin 85 or pin 85b or similar. I don't know how far you are turning the key? Some vehicle circuits shut down when you turn to the start position to crank the engine. If you are turning all the way to 'start' and things are shutting down then it could be normal but not enough power in the battery to crank the engine / problem with the starter motor solenoid or starter circuit.


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mt2man Posted a lot Posts: 1,364	No power when you turn the key, battery is charged mt2man @mt2man
	Jul 28, 2012 18:30:02 GMT Select Post Deselect Post Link to Post Back to Top
	Yeah ill get the multi meter out tomorrow and have a play and see whats what! The relays in question are just simple relays so can easily bypass them The relay trys to power when you turn the ignition to on, but there isnt any lights or anythign coming on. If i try to crank it over nothing happens at all


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mt2man Posted a lot Posts: 1,364	No power when you turn the key, battery is charged mt2man @mt2man
	Jul 29, 2012 19:18:07 GMT Select Post Deselect Post Link to Post Back to Top
	It was simply a corroded connection on the main fuse that runs from the back to the front, took it off sanded the fuse down and cleaned up the connectors and it started first turn of the key . Not bad considering it has been sitting a year and has year old fuel in it!


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