Can some ID a Diode on 88 Bronco11

[2 bronco 11s]

Does anyone know what the Diode by the Master cylinder on a 1988 Bronco 11 is for? Ford part # E77B-14A601- AB. Mine is yellow. I can get a picture. Thanks

 

[RonD]

Try this part number: F57Z-14A601-AA

See if it matches what you have

 

[2 bronco 11s]

Try this part number: F57Z-14A601-AA

See if it matches what you have

Here is a photo.

 

[PetroleumJunkie412]

Can some ID a Diode on 88 Bronco11

Nope, this is a Fiero forum.

 

[RonD]

That's a combo resistor / diode used for the Brake warning light on the dash

Can have 3 or 4 wires

Hooked to brake light in dash
Fluid level sensor in Master
Parking brake switch

Look at 2nd page here: https://f01.justanswer.com/hdgene/e9537020-cf50-42c1-9474-df7e36a30850_IC.pdf

Even has same part number next to it, but can not get that part number to come up on searches

But its not part of vehicle operations, which is good, but is a warning system for Brake issue, so would be good to have working

 

[2 bronco 11s]

Thank You. Having charging problems. Someone said they thought the older Fords used a Diode in the charging system. I'll keep searching for the problem.

 

[RonD]

All alternators have internal diodes so yes, there are diodes

1988 BII should be running a Gen 2 or 3 alternator with internal voltage regulator
And you should have a voltage gauge in the dash not an AMP meter

Charging Systems are very easy to test
Key off
Test battery voltage, should be 12.3v to 12.8v, this is to get Baseline voltage of the system that you will need for next tests
(Batteries under 12.3volts are either drained or bad, bad battery will go dead on its own, even unhooked)

On the back of the alternator is the B+ terminal, stud and nut terminal
Put volt meter black probe in alternators metal case(all test need to be done with black probe on the case)
Red probe on B+, with its wire still attached, should see Battery Voltage(tested above), EXACTLY, no drop
If no volts there is a blown Fusible link, if less volts a corroded connection
(if less volts move black probe to battery negative, if higher volts then you have a bad Battery negative cable, clean or replace)

Pull out the 3 wire plug on the back of alternator
Test yellow wire, should have battery voltage
If not then different fusible link is blown, if less volts then corroded connection

Test Green wire, should be 0 volts
Turn key on, engine off
Re-test green wire, should have Battery volts, can be 0.2 less since key is on
This green wire is the ON/OFF switch for the alternator, so important, its 12v comes from ignition switch, no fuses, it passes thru Battery Light(Charge light), so no battery light with key on means no 12v on that green wire

Make sure the White jumper wire is plugged in to alternator on its single spade terminal, and not frayed at either end

If these 3 wires test as OK, and white wire looks OK, then the Trucks Charging system is OK

Start engine
Test battery voltage, 14.1v to 14.8v is expected just after startup
If under 13volts then alternator is bad, doesn't matter if its new, or your 3rd new alternator, its bad
Because if wires are good and alternator is not charging then its bad, not a maybe, or could be something else, its bad

 

[2 bronco 11s]

I am having a weird problem. I have one that I gave my grandson 5 years ago. Had electrical problems. Finally removed the engine harness and repaired that black and white wire in 3 places. problem solved. This one is confusing. Have tested for ground on the entire engine and body. Completes the circuit everywhere. starter , alt , ecm ,ecm relay , distributor and starter solenoid new and finally took all of it of a running ranger , same result . New ground cable , grounded to frame and block. Meter when hooked to battery says not charging. take negative probe touch anything on engine says 13.72 volts. Also new battery. Even took the battery out of my pickup same result. 2 of the fuse links on solenoid have been replaced with a fuse style way back. the third on is ok . I only tested one of the 3 wires coming out however. Will test the other 2 today. My grandson is bringing his after work so I can probe his. Needless to say I am stumped.

 

[pjtoledo]

so you're saying you get different readings at each end of the battery-to-block ground cable?

 

[2 bronco 11s]

Yes. Found a wire that had been repaired that wasn't making connection. Don't know if it fixed it because now it won't hold fuel pressure. Gonna test pressure regulator tomorrow. You think after I went thru wiring trouble on one I fixed for my Grandson I would of learned my lesson on the 88 bronco 11's. But he loves it. 90,000 on it now. So my other grandson had to have one just like his!!! The 90 ranger I bought for my other grandson has a much better wiring harness than them. He will get it in 6 months when I'm done with it and he gets his full permit. Thanks