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Brakelight fuses keep blowing on 1986 Mazda B2000 pickup


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lablady
Novice

Aug 14, 2006, 4:39 PM

Post #1 of 7 (4169 views)
Brakelight fuses keep blowing on 1986 Mazda B2000 pickup Sign In

Help! We can't figure out why the brakelight fuses (15 amp) keep blowing on our pickup. We used to get a few brakes in before they blew, now when we're replacing the fuses, they're blowing right then and there. Any suggestions?? Need to resolve this ASAP as this is on my husband's work truck and he HAS to have the brakelights working.

Many thanks! Wink

lablady


(This post was edited by lablady on Aug 16, 2006, 12:45 PM)


DanD
Veteran / Moderator
DanD profile image

Aug 15, 2006, 4:02 AM

Post #2 of 7 (4158 views)
Re: Brakelight fuses keep blowing on 1984 Mazda B2000 pickup Sign In

Does this fuse only blow while applying the brakes or as soon as you put the fuse in?
The wiring diagram for this truck shows that the horn and turn signals are also on this circuit. The wire leaving the fuse box feeding these different circuits is a white wire with a blue tracer (stripe).
Looking for a short to ground at times is like looking for a needle in a haystack.
I would try disconnecting things like the brake light switch, horn relay and the turn signal switch; one at a time and checking if the fuse will hold or not.
With some luck this may narrow down your search.
Dan.

Canadian "EH"






Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Aug 16, 2006, 5:32 AM

Post #3 of 7 (4152 views)
Re: Brakelight fuses keep blowing on 1984 Mazda B2000 pickup Sign In

Just a thought: (caution LOL) See how the sockets look corrosion wise for the brake lights. I live in the rust belt of USA and that crap can drive you nuts. New sockets are available if you think that is the problem. Hope it's just that simple, T



lablady
Novice

Aug 16, 2006, 12:45 PM

Post #4 of 7 (4147 views)
Re: Brakelight fuses keep blowing on 1984 Mazda B2000 pickup Sign In

Dan,

Sorry, I was mistaken. The pickup is a 1986 model. Would this diagram hold true for a 1986 Mazda B2000 pickup? My husband thinks the short might be in the horn (horn hasn't been working). He didn't put that thought together until after reading your response. After putting in a fuse last night which actually didn't blow right away, he tested the horn this morning and it worked for that test but now the brake lights aren't working again. And now the horn isn't working again. Seems like there may be a connection, but how to repair it? The turn signal has always worked and is still working. He's going to go through your suggestions, one at a time.

Thank you!

lablady and husband


lablady
Novice

Aug 16, 2006, 12:59 PM

Post #5 of 7 (4145 views)
Re: Brakelight fuses keep blowing on 1986 Mazda B2000 pickup Sign In

Tom,

It was also suggested by the auto parts store person to check the light sockets for corrosion, loose wires, bare wires, etc.. He did check and didn't find anything. But then after his check, the fuses would blow upon inserting them. He thinks he may have made the problem worse somehow by checking the wires. My husband then replaced the whole left rear signal package (w/one from a salvage yard which was much cleaner) - last night. No corrosion on the old one, but one of the wires on the old "package" was chafed. Initially, we thought that was what it was because then the brake lights worked (the fuse was holding). Then, he went on to investigate his horn (button was sticking and wasn't working all the time). Thinking that the horn problem may be related to the brake light problem after reading Dan's reply, he partially dismantled horn/steering wheel and all seemed to be fine, replaced the brake light fuse and it was working until today (from last night) when he tested the horn. The horn worked fine, drove a short distance, tried the horn again and it didn't work and when he got home, he looked at the brake light and the fuse was blown again. One thing he hasn't tried to investigate yet is the turn signal links. That's next.

Thank you for your insights and help! We'll keep you and Dan updated. Smile

Thanks again!

lablady and husband


DanD
Veteran / Moderator
DanD profile image

Aug 16, 2006, 1:31 PM

Post #6 of 7 (4138 views)
Re: Brakelight fuses keep blowing on 1986 Mazda B2000 pickup Sign In

Keep working at it you'll find the problem.

Canadian "EH"






Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Aug 16, 2006, 1:32 PM

Post #7 of 7 (4137 views)
Re: Brakelight fuses keep blowing on 1986 Mazda B2000 pickup Sign In

Right now I think the horn stuff is the problem and may require taking the steering wheel off which will require a puller to even look at the items in most cars, T







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