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1985 Toyota mr2, alt wont charge battery
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Mr.black4242
New User
Nov 1, 2015, 12:19 PM
Post #1 of 6
(1210 views)
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1985 Toyota mr2, alt wont charge battery
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Hey guys,
I have a 1985 Toyota mr2, currently I'm trying to get it running correctly. When I bought it it started and drove but died a few miles down the road. The lights dimmed and the volt meter read low. I bought a new altinator and the battery and replaced both, thought it was fine but the car runs until the battery flattens. All the fuses in the car are good but the charging fuse in the engine compartment reads 10.84 volts dc on one side to ground and nothing on the other end. The wires all test good for continuity, and I have a good ground. I'm genuenly stumped. Any help would be great
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Mr.black4242
New User
Nov 1, 2015, 12:50 PM
Post #2 of 6
(1199 views)
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Re: 1985 Toyota mr2, alt wont charge battery
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Anything is helpful
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 1, 2015, 1:42 PM
Post #3 of 6
(1197 views)
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Re: 1985 Toyota mr2, alt wont charge battery
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? Charging fuse shows something on one side and dead on the other? Does a new one blow right away?
Crude basics on a near obsolete car IMO. No clue what Toyota set this up to do exactly but some maybe ideas and warnings.
Adjustment of those alternators was hokey at best, frequently broke, could be rigged - IDK. Could be a wire is now pinched/squished in the area messing up the whole show.
The Warning: New battery and alternator depend on each other and can kill each other - prior ones probably did just that the these will too if you aren't fast to find the fault.
Any plug in connections to alternator now in question might even be disconnected inside or shorted.
At least do this much while looking for where the fault wire or plug is: Charge this battery (negative cable off) with a charger till it reads (get a type that quits when done) charged and take voltage reading 10 minutes with charger disconnected and battery still disconnected. It should read 12.6V if perfect. Close - real close OK within marginal error of you meter? If way off that battery may already have suffered from both maybe being charged way to fast by alternator then allowed to drain till car doesn't run can't take that much never mind the reason it's not charging now,
T
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 2, 2015, 12:41 PM
Post #4 of 6
(1177 views)
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Re: 1985 Toyota mr2, alt wont charge battery
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If you have voltage on one side of the fuse and not the other, the fuse is bad.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Mr.black4242
New User
Nov 8, 2015, 1:04 PM
Post #5 of 6
(1147 views)
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Re: 1985 Toyota mr2, alt wont charge battery
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So I fixed the issue. The fuse was good I knew that from the beginning it was one side of the fuse clip that wasn't getting power.
I opened all the wiring harnesses and traced out the wire going from that fuse clip. It was a black and yellow wire. It correlated with a black and yellow wire that comes off of the voltage regulator mounted on the altinator . the wire was spliced by toyota and went to the computer and the charging fuse. The altinator was only putting out 11.84 volts dc. I tightened the belt and it out out 14.1 volts dc but still didn't charge. So I replaced the butt-splice to the computer to the connection plug in the trunk that goes to the fuse. Got 0.2 resistance so I knew it had good connection. Started the car and boom car charged now
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 8, 2015, 3:20 PM
Post #6 of 6
(1144 views)
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Re: 1985 Toyota mr2, alt wont charge battery
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Glad to read that you got it figured out. Thank you for the follow up on this. Maybe it might help someone in the future. Closed as solved. Can be reopened by the request to the moderator.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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