Radio not working

Submitted: Thursday, Feb 04, 2016 at 17:13
ThreadID: 131548 Views:1982 Replies:8 FollowUps:1
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I have a 75 series Troopie and the radio and cig lighter stoped working a few weeks ago .

The radio fuse and cig fuse are fine , I have power on only one wire in the radio loom.(yellow wire , checked with multimeter )

I was under the impression I would need a power wire and a memory wire.

I have also swapped radios to eliminate the radio as the problem.

Any help would be appreciated

Cheers
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Reply By: TomH - Thursday, Feb 04, 2016 at 18:37

Thursday, Feb 04, 2016 at 18:37
CORRECTION. RED wire is normally which is what turns it on and off YELLOW wire is the memory wire from the battery. Would be surprised if radio and cig lighter are on the same one Otherwise it could be an earth wire come loose if you have power on the yellow radio should retain station settings. If red has no power it could be a fuse.
Some brands have those two reversed but not usually.
AnswerID: 595913

Reply By: Dean K3 - Thursday, Feb 04, 2016 at 18:57

Thursday, Feb 04, 2016 at 18:57
Would need alot more info what type of radio brand etc

I am yet to find a radio that requires a wire for memory purposes and unlike computer they don't have a clock involved.

All tait gme vertex simoco I have handled in past only needed two wires power and earth, whoich should be a battery not chassis earth
AnswerID: 595915

Follow Up By: TomH - Thursday, Feb 04, 2016 at 21:43

Thursday, Feb 04, 2016 at 21:43
I took it he is talking about the vehicle radio (stereo) which does require two wires for power.

He does say the radio fuse is Ok and that the yellow wire to the radio has power and thought he should have two to the radio
I have been known to be wrong once!!!! LOL
1
FollowupID: 864677

Reply By: Wayne R6 - Friday, Feb 05, 2016 at 09:01

Friday, Feb 05, 2016 at 09:01
All the latest radios have two +12V inputs. One should be permanent which keeps all the preset channels in the radio. This one uses very little power. The other is to turn on the radio. I am pretty sure that most vehicles have the radio and cig lighter on the same fuse. If you are positive that the fuse is OK (measured with a multimeter) then you will have to check wiring from the fuse to the radio / cig lighter which will probably be a connector behind the dash.
AnswerID: 595936

Reply By: vk1dx - Friday, Feb 05, 2016 at 09:37

Friday, Feb 05, 2016 at 09:37
What Wayne said is about right.

The clue is that the cigarette lighter power packed it in at the same time. It could be more so be wary.

Maybe something has penetrated or partly broken the loom somewhere (that's bad news). Or it could be a loose connection at the back of the fuse box (better news).

Has anything else failed?

Measure the resistance between one end and the other (fuse socket to cigarette lighter or radio). It should read a short or very low resistance between the two ends.

An open circuit or high resistance means that the wire is broken, or a connector is loose etc. But it won't show where so you would need to chase it to see why it broke.

If you can't see it or don't find a loose connector etc, then I would suggest that you take it to an autoelectrician there may be something worse going on.

Phil

AnswerID: 595940

Reply By: TomH - Friday, Feb 05, 2016 at 10:08

Friday, Feb 05, 2016 at 10:08
Check the earth wires for a start If you have power on the yellow and it wont go ,thats the logical place to start
AnswerID: 595944

Reply By: Malcom M - Friday, Feb 05, 2016 at 11:56

Friday, Feb 05, 2016 at 11:56
Maybe buy a Haynes or Gregories manual and trace the circuit?
AnswerID: 595950

Reply By: craigandej - Friday, Feb 05, 2016 at 15:51

Friday, Feb 05, 2016 at 15:51
Hi
Yellow wire is to constant power for clock, station presets etc. Red will be power via ACC on ignition. If its an aftermarket radio it sounds like its tapped into Cig circuit and may have an inline fuse stuffed behind dash somewhere.

Cheers
AnswerID: 595957

Reply By: HKB Electronics - Saturday, Feb 06, 2016 at 13:08

Saturday, Feb 06, 2016 at 13:08
In some vehicles the accessory power is switched via a relay, check the main fuse box in the engine for said relay, it may be faulty.

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AnswerID: 595982

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