'85 - No electrical power - Theft deterrent system?
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Pro
Joined: Dec 2006
Posts: 557
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From: Austin Texas
'85 - No electrical power - Theft deterrent system?
I'm having a problem with my '85 this morning. Out at 6:30am for a nice drive in what passes for cool temps in Austin these summer months. Home, normal shut down but when attempted to head out again at 7:15am and turned ignition key, barely audible "click" and then no electrical power - no lights, no dash, no fuel pump and no start!
Checked battery (2 weeks "old" and fully charged) and searched Forum and found several suggestions (C100, fusible links, etc). Then at 8:30am I re-tried it and all lights worked normally but when I turned ignition key to "On" (not "Start"), all electrical power off again. I tried it again another two hours later but this time no "reset".
It's the "reset" that's puzzling me as this seems inconsistent with fusible links as I understand these work just like fuses and can't "reset", they're either good or bad. Next thought is the Starter Interrupt Relay in the Theft Deterrent System. According to Forum posts if the fusible link to the starter fails all power is lost and I wonder if the Starter Interrupt Relay has the same effect. But if that's it, I don't know how to reset the relay with no power.
Anyone have any ideas?
Thanks!
John
Checked battery (2 weeks "old" and fully charged) and searched Forum and found several suggestions (C100, fusible links, etc). Then at 8:30am I re-tried it and all lights worked normally but when I turned ignition key to "On" (not "Start"), all electrical power off again. I tried it again another two hours later but this time no "reset".
It's the "reset" that's puzzling me as this seems inconsistent with fusible links as I understand these work just like fuses and can't "reset", they're either good or bad. Next thought is the Starter Interrupt Relay in the Theft Deterrent System. According to Forum posts if the fusible link to the starter fails all power is lost and I wonder if the Starter Interrupt Relay has the same effect. But if that's it, I don't know how to reset the relay with no power.
Anyone have any ideas?
Thanks!
John
Le Mans Master
Joined: Feb 2005
Posts: 6,485
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From: Clearwater Florida
..... My vote is corrosion - as in that powdery white stuff - in one or more or the wires at the positive battery terminal or the junction between the battery and firewall where the fusible links all congregate ... I have found them on occasion to be swollen with corrosion but still passing electrons ... I really doubt any involvement with the interrupt relay ... it controls the power to the starter solenoid only when the key is turned to the start position .............
Last edited by C409; Jul 21, 2011 at 01:49 PM.
Poor connection at battery or juction block.
Thread Starter
Pro
Joined: Dec 2006
Posts: 557
Likes: 4
From: Austin Texas
..... My vote is corrosion - as in that powdery white stuff - in one or more or the wires at the positive battery terminal or the junction between the battery and firewall where the fusible links all congregate ... I have found them on occasion to be swollen with corrosion but still passing electrons ... I really doubt any involvement with the interrupt relay ... it controls the power to the starter solenoid only when the key is turned to the start position .............
Last edited by AustinJohn; Jul 21, 2011 at 03:27 PM.
Racer
Joined: Jan 2007
Posts: 252
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From: bethlehem PA
Le Mans Master
Joined: Feb 2005
Posts: 6,485
Likes: 566
From: Clearwater Florida
Not necessarily C100 ... but the jump start connector ... it is low and behind the battery , has a single stud sticking straight up and has a half dozen or so red wires attached ... most of those are fusible links ... check all of them closely ... its best to remove the battery for access ...
