 25Amp Relay Board Fuse, Relay Board Amp fuse |
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| tbone1819 |
 Mar 9 2023, 11:40 AM
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#1
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Newbie  Group: Members Posts: 26 Joined: 1-February 17 From: Lynbrook NY Member No.: 20,800 Region Association: North East States  |
Hey all,
Just wondering if any of you have run into the 25A relay board fuse blowing. I've had the fuse go twice after taking the car on a good run and after the car has completly cooled down. What ground could be bad? Where should I start? |
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| 914Sixer |
Mar 9 2023, 11:55 AM
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#2
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region 
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Check floor heater lever.
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| ejm |
Mar 9 2023, 12:29 PM
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#3
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I can see the light at the end of the tunnel Group: Members Posts: 2,691 Joined: 3-February 03 From: Massachusetts Member No.: 224 Region Association: None |
That fuse powers the heater fan, fuel pump and aux air regulator. I would look closely at the aux air regulator wiring. I could have broken insulation and be touching the case or the wire could be touching right where it enters the regulator.
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| dr914@autoatlanta.com |
Mar 9 2023, 12:56 PM
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#4
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914 Guru Group: Members Posts: 7,853 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
The 25 amp relay board fuse blowing on an MPC car could be caused by the fuel pump running too hot and old, the aux air valve or the heater aux blower fan. all are on the same circuit
QUOTE(tbone1819 @ Mar 9 2023, 10:40 AM)  Hey all, Just wondering if any of you have run into the 25A relay board fuse blowing. I've had the fuse go twice after taking the car on a good run and after the car has completly cooled down. What ground could be bad? Where should I start? |
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| tbone1819 |
Mar 9 2023, 04:07 PM
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#5
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Newbie Group: Members Posts: 26 Joined: 1-February 17 From: Lynbrook NY Member No.: 20,800 Region Association: North East States |
QUOTE(914Sixer @ Mar 9 2023, 12:55 PM) Check floor heater lever. The lever itself? |
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| 914Sixer |
Mar 9 2023, 06:41 PM
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#6
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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Lever has green wire (12v) connected at the base. Raising the lever completes the circuit to turn on blower fan in engine compartment. Check relay board bottom for corrosion, check fuel pump relay.
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